(NEW YORK) — New guidelines from the American Cancer Society are expanding colon cancer screening options beyond colonoscopies and established stool-based tests.
The recommendations still call for colorectal cancer screening in people at average risk starting at age 45 and continuing through age 75 for those with a life expectancy of 10 more years.
And colonoscopy is still considered the gold standard test.
But for the first time, the updated guidelines now include a blood-based screening test done in a doctor’s office. They also add new stool sample kits and a recently FDA-approved at-home test that looks for blood and different molecular markers in stool samples.
Experts note that offering more choices is critical to address gaps in screening for this highly preventable disease, which is most treatable when caught early.
“Individuals who decline or do not complete [testing] are probably a greater number than are actually appreciated,” Dr. William Dahut, chief scientific officer for the American Cancer Society, told ABC News. “And I think a lot of our data on colorectal screening probably overstates the number of people actually up to date on their screening guidelines.”
As the new guidelines point out, the most effective colorectal cancer screening test is the one people are willing to get. More than 20 million eligible Americans remain unscreened, according to the ACS.
While stool-based tests are reasonable options for most people, the new guidelines stress that the blood tests should be considered a last resort for people unable or unwilling to get any other form of testing because they are less likely to catch issues compared to other types of screening.
People who choose colonoscopy should be tested every 10 years. Other screening tests should be done every one, three, or five years, depending on the specific method selected.
These new guidelines come as colon cancer rates rise in younger adults across the US. ASC statistics show that 1 in 5 new colorectal cancer cases now occur in people younger than 55, up from about 1 in 10 in the mid-1990s.
“This is a disease that historically, we saw in older individuals, so people 50 and over or maybe even 60 and over. And now we are starting to see an inching up of incidents in people who are less than age 50,” Dr. Fola May, associate professor of medicine at the David Geffen School of Medicine at UCLA, told ABC News.
She said she hoped that having a range of choices would push more people to get tested.
The ACS likely wants to “make sure that patients understand that these tests can be done at home. So you don’t need to take a day off of work. You don’t need an escort, you don’t need to have an invasive procedure,” May said.
The ACS advised people to work with a trusted healthcare provider to decide which test is best for them.
Dahut stressed that the recommendations apply only to people of average risk without symptoms and with no family or personal history of colorectal cancer. Consumers should check with their insurance provider to see which options their plan covers.
It’s important to be aware of the symptoms and take them seriously, he added.
“So if one has symptoms, blood in their stool, symptoms of obstruction, abdominal pain that’s persistent or change in stool patterns, then they need to have a workup for those symptoms and not have a blood-based test like this or a stool-based test,” he said.
Ari Goldstein, MD, MPH, is a board-certified family physician and preventive medicine resident at Johns Hopkins Bloomberg School of Public Health
(GENEVA, Switzerland) — The head of the World Health Organization warned on Monday that a rapidly growing Ebola outbreak in the Democratic Republic of Congo and Uganda “will get worse before it gets better.”
More than 900 cases and more than 220 deaths have been reported in the DRC, WHO Director-General Dr. Tedros Adhanom Ghebreyesus said during a virtual briefing. Of those totals, 101 cases and 10 deaths have been confirmed.
Additionally, there have been five travel-related cases and a death in Uganda, according to the WHO and the Uganda Ministry of Health.
“We are facing an extremely serious and difficult outbreak. It will get worse before it gets better,” Tedros said on Monday. “But we know this virus, and we know how to stop it. We have stopped every previous Ebola outbreak, and we will stop this one, too.”
Tedros said he wanted to echo comments made by South African President Cyril Ramaphosa about overcoming the outbreak with unity.
“The question is just how quickly we can do it, and how many more lives will be lost before we do,” Tedros added.
Tedros’ comments come amid a hospital in northeastern Congo facing growing tension as officials have trouble following safety rules following the death of a well-known religious leader.
Dr. Richard Lokudi, director of the Mongbwalu General Referral Hospital in Ituri province — one of three provinces where the Ebola outbreak is concentrated — told ABC News the facility is under heavy tension after the body of a confirmed Ebola victim, who was also a major religious figure in the region, was brought there.
Lokudi said that family members and groups of young people are demanding the body be returned.
Because the patient was a confirmed Ebola case, authorities are insisting on a “safe and dignified burial” under outbreak protocols, and the body is being temporarily kept at the hospital until burial on Monday.
Lokudi said police and military forces have been securing the hospital and firing warning shots to disperse protesters gathered outside.
He added that the gunfire around the hospital has left him exhausted and stressed.
Last week, Tedros classified the Ebola outbreak as a public health emergency of international concern — one level below a pandemic in the United Nations agency’s alert system.
The WHO continues to consider the national risk assessment as “very high” while the regional level risk remains “high” and the global risk level remains “low,” Tedros said on Monday.
The outbreak has led to multiple countries, including the U.S., India, the U.K. and Australia, putting travel restrictions in place.
Entry to the U.S. is restricted to foreign travelers who have recently been in the DRC, Uganda and South Sudan.
Meanwhile, U.S. passport holders and U.S. nationals returning to the U.S. from the three countries will be funneled to Dulles Airport in Virginia to be screened for symptoms and interviewed about possible exposure.
Enhanced screening efforts have also begun at Hartsfield-Jackson Atlanta International Airport as of Saturday morning and efforts at George Bush Intercontinental Airport in Houston will begin late Tuesday.
Lawful permanent residents (green card holders) who have been in any of the three countries over the last 21 days are barred from entering the U.S. temporarily.
Tedros said on Monday that WHO teams are on the ground in the outbreak zones assisting with response including contact tracing, establishing treatment centers and infection prevention and control. Tedros added that he will be traveling to the DRC on Tuesday.
The WHO chief said that several aspects of this outbreak make it “especially challenging,” including the delays in detecting the outbreak.
“[It] means that we are now playing catch-up with a very fast-moving epidemic,” he said on Monday.
US doctor infected with Ebola critically ill but says he is ‘cautiously optimistic’ He said that due to recent fighting in the provinces facing the brunt of the outbreak, it means tens of thousands of people are displaced and there is “significant distrust of outside authorities among the local population.”
An additional challenge is that there are no approved vaccines or treatments for the strain of Ebola responsible for the outbreak: Bundibugyo virus.
Tedros said the WHO has recommended prioritizing two monoclonal antibodies to advance in clinical trials and recommended evaluating the antiviral obeldesivir in a clinical trial as post-exposure prophylaxis for those who are high-risk contacts.
ABC News’ Eric M. Strauss contributed to this report.
A medical staff member disinfects a quarantine room in an Ebola treatment center in Bunia, Ituri province, Democratic Republic of the Congo, on May 21, 2026. (Str/Xinhua via Getty Images)
(NEW YORK) — The Ebola outbreak in the eastern Democratic Republic of the Congo is “spreading rapidly,” the head of the World Health Organization warned during a press briefing on Friday.
WHO Director-General Dr. Tedros Adhanom Ghebreyesus warned that the U.N. health agency has upgraded its risk assessment for spread at the national level from “high” to “very high.” At the regional level, the risk remains “high” while the global level is still “low.”
There have been almost 750 suspected cases and 177 suspected deaths from Ebola in the DRC, the WHO said in a post on X.
So far, at least 82 cases of Ebola have been confirmed in DRC as well as seven deaths, but Tedros said “we know the epidemic in the DRC is much larger.”
Tedros described the situation in Uganda as “stable” with two cases confirmed in people who traveled from the DRC, with one death.
The epicenter of the current outbreak is in a “highly insecure” area — the DRC’s eastern provinces of North Kivu and Ituri — where ongoing armed conflict has sparked a displacement crisis, according to Tedros.
The WHO chief also acknowledged a “security incident” that took place Thursday in Ituri in which “medical tents and supplies were set on fire.” He noted that building trust in the local communities is “critical.”
The WHO’s representative in the DRC, Dr. Anne Ancia, who appeared from the field via video link during the press briefing, said Thursday’s incident “significantly jeopardized” the Ebola response operations her team is trying to initiate in the hotspot area.
She noted that there is still very low contact tracing in Ituri, particularly the city of Bunia, but that there was better contact tracing happening in North Kivu.
So far, one American has contracted Ebola in relation to the outbreak. Dr. Peter Stafford tested positive after treating patients in the eastern DRC.
He was evacuated to Germany and is currently being treated at Charite University Hospital in Berlin in an isolation ward, the hospital said.
Stafford’s wife and children, who are considered high-risk contacts, are also at the hospital and are currently in quarantine in a separate section of ward. The family is symptom free, according to the hospital.
The hospital said that Stafford does not currently require intensive care but is “severely weakened” from his illness.
Stock image of dental chair. (Zhenjin Li/Getty Images)
(PHILADELPHIA) — Health officials in Philadelphia are recommending certain patients of a dental clinic accused of following “unsanitary practices” get tested for hepatitis and HIV due to potential exposures from April 2025 to May 2026, the city’s Department of Public Health said in a statement this week.
Officials on Wednesday identified the dental clinic in Center City Philadelphia as Smiles at Rittenhouse Square, also called Smiles on the Square, and said it is now closed due to the dentist’s temporary suspension.
James Garrow, Philadelphia’s deputy health commissioner, told ABC News the risk is believed to be low to patients at this time because they have yet to identify any associated cases of hepatitis or HIV linked to this dentist office.
“We don’t have any known reason to say that the risk will be potentially high, but the fact of the matter is, when you are in a dentist office that’s unsanitary, unsafe, the risk always exists,” Garrow said. “So that’s why we’re really pushing folks who are patients there to get tested and make sure.”
The sole dentist practicing at this office has since had their license temporarily suspended, state records show.
“On May 15, 2026, the State Board of Dentistry suspended Dr. Kirti Chopra’s professional license in Pennsylvania because her continued practice of dentistry presents a clear and immediate danger to public health and safety,” a Pennsylvania Department of State official said in a statement to ABC News.
The alleged sanitary problems in the clinic were discovered during an unannounced site visit, the suspension order, reviewed by ABC News, said.
According to the order, the dentist allegedly admitted to investigators that used injectable medication vials were occasionally set aside for reuse on other patients and IV saline bags intended for single use were reused between patients.
Investigators said they identified multiple issues with sterilization and sanitation practices during the site visit that include finding dental instruments that were not properly sterile, handled with potentially contaminated gloves, and packaged in potentially contaminated pouches.
They also reported finding dental handpieces that came into contact with blood and saliva left attached to patient equipment after use that should be sterilized between patients.
The dentist’s temporary suspension order concluded that these findings “place patients at risk for transmission of hepatitis C, hepatitis B, Human Immunodeficiency virus (HIV), as well as outbreaks of viral, bacterial or fungal infections.”
Hepatitis viruses and HIV are spread through contact with infected blood or body fluids. Garrow said exposure at a dentist’s office is “exceedingly rare” but it is possible to get infected if exposed through contaminated dental equipment.
“The fact of the matter is, if someone who is a patient there was exposed to one of these diseases… these are potentially life-changing chronic conditions,” Garrow said.
Doctors tell ABC News potentially impacted patients may need multiple blood tests, depending on the timing of a potential exposure.
“If it’s a recent exposure it would be a minimum of two or three blood draws to establish a baseline and then follow-up testing to determine seroconversion,” Dr. George Diaz, a spokesperson for the Infectious Disease Society of America, told ABC News.
Doctors say hepatitis B is considered one of the more transmissible bloodborne viruses in healthcare settings when sterilization procedures aren’t followed or if contaminated instruments are reused.
The hepatitis B vaccine offers the best line of protection for a person who is exposed to this virus.
“In this case, vaccination against Hepatitis B would be protective against exposures such as this,” Diaz said. “Risk is virtually zero for those that are vaccinated.”
There are no current vaccines to prevent HIV or hepatitis C. Treatment options vary for each virus, based on timing of exposure or infection.
According to Garrow, the health department is working to finalize a list of patients potentially at risk but due to the timeframe of potential exposure, he estimates that number “could be in the hundreds.”
Garrow also said that there is another dental clinic in the same building with a similar name, Rittenhouse Smiles, that is not under investigation, and they are working on messaging to minimize patient confusion.
Officials say people who are unsure about potential exposure or patients of Smiles at Rittenhouse Square should call 215-685-5488, a hotline the health department set up that is open between 8:30 a.m. and 5 p.m. ET, Monday through Friday.
“Dr. Chopra is cooperating with the Department of Public Health and the Pennsylvania Department of State,” a lawyer representing Chopra and Smiles at Rittenhouse Square said in a statement to 6ABC Philadelphia on Wednesday. “Dr. Chopra will continue working cooperatively with public-health officials regarding patient notification, testing recommendations, and any required infection-control remediation.”
Mark Abdelmalek, MD is a medical contributor and investigative reporter for ABC News. Jade A. Cobern, MD, MPH, is a fellow of the ABC News Medical Unit.
Female Aedes mosquitoes, including the Asian tiger mosquito (Aedes albopictus) and the yellow fever mosquito (Aedes aegypti), are observed feeding on human blood in Tehatta, West Bengal, India, on May 01, 2026. These mosquitoes are known to transmit diseases such as dengue, chikungunya, Zika, yellow fever, and West Nile virus. Rising temperatures are contributing to their survival. (Photo by Soumyabrata Roy/NurPhoto via Getty Images)
(TEXAS) — Texas health officials on Tuesday confirmed the state’s first human West Nile virus case this year, an indication that mosquito season is beginning in the United States.
Public health officials have been warning that rising temperatures have allowed mosquitoes to thrive, increasing the risk of the diseases that they spread, including West Nile.
Last year, the U.S. reported 2,076 cases of West Nile across 47 states, according to data from the Centers for Disease Control and Prevention. Colorado had the highest number of cases (285), followed by Illinois, Texas, Minnesota and California.
The Texas Department of State Health Services said the patient was a resident of Harris County, which includes Houston, but no other information about the patient was made available.
“West Nile and other mosquito-borne illnesses are a fact of life in Texas in the warmer months, and all Texans should take precautions against mosquito bites to stay safe and healthy,” Texas DSHS Commissioner Dr. Jennifer A. Shuford said in a press release. “By removing standing water around the home, people can eliminate mosquito breeding grounds and reduce insect populations in their area.”
Since 1999, West Nile virus has killed about 2,900 Americans, according to the CDC. Cases are typically reported between June and October, historically peaking in August.
The virus is spread through the bite of an infected mosquito. Risk increases with older age, certain medical conditions — such as cancer, high blood pressure and kidney disease — and a weakened immune system.
Symptoms include fever, headache, body aches, vomiting, diarrhea and a rash. Severe illness can affect the central nervous system and result in hospitalization or death, according to the CDC.
There is currently no vaccine that protects against West Nile virus, and preventing mosquito bites is the best way to protect yourself, the CDC says.
No specific treatments are available. Doctors recommend patients rest, drink fluids and take pain medication to help relieve some symptoms. People with severe illness may need to be hospitalized for supportive treatment, according to the CDC.
The CDC says most people infected with West Nile virus are believed to have lifelong immunity. However, some with weakened immune systems or certain conditions may have their immunity wane over time.
Health supplies are seen as healthcare workers receive training on administering the Ebola vaccine in a study carried out with the support of the World Health Organization as part of the fight against the Ebola virus in Kampala, Uganda on February 14, 2025. (Nicholas Kajoba/Anadolu via Getty Images)
(NEW YORK) — A deadly Ebola outbreak is continuing to spread in the Democratic Republic of Congo and Uganda, with officials on Tuesday saying there were more than 600 confirmed and suspected cases and more than 100 suspected deaths.
The World Health Organization (WHO) declared the outbreak a public health emergency of international concern, and at least one American in the DRC has tested positive, according to the Centers for Disease Control and Prevention (CDC).
Several public health experts told ABC News that while they agree with the CDC that the risk to the U.S. public is currently low, the outbreak is still concerning. They also expressed unease that the U.S. may not be prepared to adequately respond due to cuts to federal health agencies and its withdrawal from the WHO.
The experts noted cases have been found in remote regions of the DRC and Uganda, as well as urban areas, and the outbreak is growing rapidly. They added that although Ebola is a rare disease, it can be highly contagious and can lead to deadly consequences.
“We’re worried that if this outbreak is not contained, that it could spread elsewhere on the continent, which could increase the risk of the virus spreading outside of the African continent,” Dr. Jennifer Nuzzo, professor of epidemiology and director of the Pandemic Center at Brown University School of Public Health, told ABC News.
“Ebola is not as transmissible a virus as, say, a coronavirus … and that’s why I don’t think that this will ever become a pandemic scenario, but it doesn’t have to be a pandemic to be a worrisome situation,” she added.
Americans affected by outbreak
On Monday, the CDC confirmed that least one American in the DRC contracted Ebola while working in the country.
Dr. Satish K. Pillai, incident manager for the CDC’s Ebola response, told reporters that the individual developed symptoms over the weekend and tested positive late Sunday, adding that the patient and six other high-risk contacts were being moved to Germany for care and monitoring.
Serge, an international Christian missions organization, confirmed the patient is American medical missionary Dr. Peter Stafford, a board-certified general surgeon with a specialization in burn care, who was serving patients in the eastern DRC.
Pillai did not say if or when the Americans would be returning to the U.S., but experts say, even if the patient and contacts do, the risk level to the public does not change.
“We safely and effectively have [returned affected Americans home] many times before,” Emily Smith, interim chair of the department of global health at the Milken Institute School of Public Health at George Washington University, told ABC News. “It’s something we have good experience in and have always safely and effectively done. So, to me, no concerns about doing that.”
Dr. Jesse Goodman, a professor of medicine and infectious disease at Georgetown University and former chief scientist at the Food and Drug Administration, said it is encouraging that when countries such as the DRC have experienced outbreaks in the past, they have not progressed to pandemic status.
“I think the most [the U.S.] would see is the kind of limited transmission that we’ve seen in the past because this virus almost always appears that transmission is from people who have symptoms,” he told ABC News. “I think if there are cases that come to this country, I would expect limited transmission and think we have the capability to contain it.”
During the 2014 Ebola outbreak, there were two cases of suspected transmission from a patient with Ebola to nurses caring for him. The CDC has established detailed infection prevention and control procedures for health facilities that suspect they have cases of Ebola.
U.S. may not be as connected to the global health community
Even with possible U.S. capability to contain Ebola domestically, the experts who spoke to ABC News said the U.S. is likely at a disadvantage when it comes to responding to several health crises both at home and abroad due to public health capacity cuts.
Last year, the State Department announced it would be taking over programs previously run by the U.S. Agency for International Development (USAID). Secretary of State Marco Rubio said the agency — which oversaw foreign aid, disaster relief and international development programs — would no longer be providing assistance to other countries.
In previous Ebola outbreaks, USAID provided millions of dollars and operational support in response, in addition to helping with preparedness activities in neighboring countries.
Additionally, earlier this year, the U.S. officially completed its withdrawal from the WHO, with federal officials saying at the time there are “plans” in place to work with organizations on surveillance, diagnostics and outbreak response to fill in gaps left by exiting the WHO.
Brown University’s Nuzzo said the Ebola outbreak is the kind of situation public health experts warned about as USAID was gutted and the U.S. withdrew from the WHO.
“We warned that the United States would be flying blind, and it would be learning about deadly outbreaks late, and then it would be very difficult for the U.S. to respond because we would have fewer tools to do that,'” Nuzzo said. “The big worry here is that the outbreak wasn’t declared until there were more than 200 suspected cases of the virus and that is very unusual. Usually, we get signals of an outbreak much earlier.”
George Washington University’s Smith concurred, “When we are talking about public health infrastructure and global health infrastructure, we’re in a worse place today than we were two years ago.”
Nuzzo also noted that the National Institute of Allergy and Infectious Diseases, an agency within the National Institutes of Health, ended research at its high containment lab in Fort Detrick, Maryland, due to “a safety stand-down” last year.
The lab was one of the few federal facilities studying Ebola and other deadly pathogens, which Nuzzo said could have been useful in understanding the virus and developing therapies for the recent outbreak.
“So now that we have Americans potentially exposed to a virus that’s deadly, for which we have no vaccines or treatments, you can imagine how beneficial it would be to have a laboratory that can conduct world-class research to make sure we develop cures for this,” Nuzzo said. “But we don’t have it. So, we’re basically behind the curve in being ready for this.”
Goodman also said that the U.S. may not be as prepared because Health and Human Services Secretary Robert F. Kennedy Jr. has been actively shifting the department’s focus away from infectious disease management and towards chronic illnesses.
During his confirmation hearings last year, Kennedy argued that too much federal funding has been “devoted” to “infectious disease and to drug development and very little to chronic diseases.”
Goodman argued that there needs to be a focus on infectious diseases because of the threats they may pose to public health.
“I think the message here is these infectious disease, we may be done with them, but they’re not done with us,” he said. “There’s a reason that so many of us work for so many years to be prepared for whatever the next thing is because we don’t know what it is and we just need to be ready.”
Kennedy told ABC News on Monday that his agency is addressing the recent hantavirus and Ebola outbreaks.
“Yeah, we’re working on it,” Kennedy replied when asked if he was worried about the outbreaks. Kennedy did not respond when asked what his message might be to Americans who are concerned about the diseases potentially spreading in the U.S.
On Sunday, the State Department issued “Level 4 — Do not travel” advisories for Uganda and the DRC due to the outbreak.
Nuzzo said she’s worried that the U.S. hasn’t built a public health system that acknowledges viral outbreaks as recurring threats, saying the U.S. has been caught off guard with previous incidents such as COVID-19.
“We don’t do that with other recurring hazards you know; we don’t try to build FEMA in the midst of a hurricane,” Nuzzo said.
Robert F. Kennedy Jr., US secretary of Health and Human Services (HHS), during a healthcare affordability event in the South Court Auditorium of the Eisenhower Executive Office Building at the White House in Washington, DC, US, on Monday, May 18, 2026. (Photographer: Jim Lo Scalzo/EPA/Bloomberg via Getty Images)
(WASHINGTON) — Health and Human Services Secretary Robert F. Kennedy Jr. told ABC News on Monday that his agency is working to address the recent hantavirus and Ebola outbreaks, marking the first time he’s commented publicly on the Ebola outbreak since the Centers for Disease Control and Prevention (CDC) confirmed than an American had been infected with the virus in the Democratic Republic of the Congo (DRC).
“Yeah, we’re working on it,” Kennedy told ABC News when asked if he was worried about the outbreaks. The secretary’s comments come after the CDC said a “small number of Americans” are directly affected by the current Ebola outbreak in the DRC.
Kennedy did not respond when asked what his message might be to Americans who are concerned about the diseases potentially spreading in America. He told reporters in the Oval Office last week that the U.S. had the hantavirus outbreak “under control.”
“We have this under control and we’re not worried about it,” he said at the White House’s maternal healthcare event on May 11th. Kennedy also noted that the CDC has been working on the outbreak since day one.
The CDC said there have been no confirmed hantavirus cases in the U.S. linked to the MV Hondius cruise ship and 18 passengers remain under observation at the University of Nebraska.
Meanwhile, Kennedy’s brief comments about the outbreaks came following a roundtable event announcing nearly $1 billion in new funding to states to address PFAS in drinking water at the Environmental Protection Agency (EPA) on Monday.
The secretary has been on a midterm blitz recently, touting the administration’s Make America Healthy Again (MAHA) movement during stops including Ohio and California.
At a subsequent event featuring Kennedy and other health leaders at the White House, Deputy Assistant to the President for Domestic Policy Heidi Overton stressed that “there are no cases of Ebola in America.”
Deputy Assistant to the President for Domestic Policy Heidi Overton stressed during the event that “there are no cases of Ebola in America.”
“We want to keep it that way and we are doing everything we can to support Americans in the region,” Overton added.
In this photo illustration, a laboratory test tubes containing blood to be analyzed for the Hantavirus “Orthohantavirus” outbreak, held by a nurse. (Vincenzo Izzo/LightRocket via Getty Images)
(DOUGLAS COUNTY, Colo.) — Colorado public health officials are investigating the death of an adult resident as a result of hantavirus.
The Colorado Department of Public Health and Environment and the Douglas County Health Department said the death is not linked to the outbreak on the MV Hondius cruise ship, which led to 11 confirmed and probable cases, including two confirmed deaths and one suspected death.
The individual lived in Douglas County — located just south of Denver — but information about the patient’s name, age and sex were not immediately available.
Health officials said the individual was infected by the Sin Nombre hantavirus, which is the most common cause of hantavirus pulmonary syndrome (HPS) in North America.
HPS symptoms typically appear from one to eight weeks after contact with the virus, with early signs including fever, fatigue and muscle aches, according to the Centers for Disease Control and Prevention. Half of HPS patients will experience headaches, chills, dizziness, nausea, vomiting, diarrhea and abdominal pain.’
Between four and 10 days after the initial phase of illness, symptoms including coughing, shortness of breath and tightness in the chest can emerge, the CDC said, adding that a patient’s lungs can fill with fluid.
“Hantavirus infections caused by the Sin Nombre hantavirus occur regularly in Colorado, usually in the spring and summer, and can cause a severe and sometimes deadly respiratory disease,” according to public health officials. “In Colorado, the deer mouse is the rodent species that most commonly exposes people to the virus. Avoiding exposure to rodents and their urine, feces, saliva, and nesting materials is the best way to prevent infection.”
According to the CDC, there were six cases of Hantavirus in Colorado from 2020 to 2023.
Medical staff direct some of the last passengers to be evacuated from the MV Hondius on May 11, 2026, in Tenerife, part of the Canary Islands, Spain. (Chris Mcgrath/Getty Images)
(NEW YORK) — Health experts tell ABC News that the current science behind the hantavirus that circulated throughout the MV Hondius does not show the same levels of transmission as with COVID-19, while acknowledging that the scenario may seem similar to the beginning of the 2020 pandemic.
“Our current understanding is that person-to-person transmission of Andes virus is relatively rare and generally associated with prolonged close contact,” the current Centers for Disease Control and Prevention public health assessment said. “There is also no documented evidence of presymptomatic transmission.”
Officials around the globe have taken major steps to prevent the spread of the hantavirus, and an American doctor who was onboard noted how conditions on the cruise ship may have helped the virus propagate.
In the U.S., the boat’s 18 American passengers have been put in quarantine in Nebraska, while more than 40 people with exposure to the sick are being monitored to see if they develop the illness.
“In the vast majority of cases it happens when people breathe in mouse secretions,” Dr. Emily Abdoler, a clinical associate professor of medicine at the University of Michigan, who specializes in infectious diseases, told ABC News.
“The Andes strain found in Chile and Argentina has the possibility of human-to-human transmission, but that’s really more really close contact. It’s not sharing the same household,” she added. “It’s more like sharing the same bed.”
Dr. Stephen Kornfeld, an American oncologist who became the ship’s de facto doctor after the Hondius’ physician contracted the virus, initially received inconclusive results with samples taken from the ship but later tested negative.
Speaking to ABC News from his quarantine on Thursday, Kornfeld noted that conditions on the ship — including ventilation and the size of rooms — could have created a “complicated” situation for transmission while observing some social casual contact.
“If you do have casual contact, you’re doing it repetitively,” he said. “There were three rooms that we would gather in many times a day, often for an hour or an hour and a half, for lectures and discussions and meals. And I can just envision lots of frequent casual contacts, and perhaps over time that adds up to something more than just a single casual contact.”
Abdoler, who helped diagnose a case of hantavirus in Michigan in 2021 — the type we have in the U.S. that does not spread between people –said the benefit that medical professionals and agencies, such as the World Health Organization, have now is that the hantavirus has been researched for over 30 years. It is not a new virus.
While the data around the Andes strain believed to have been on the boat is still limited given the rare number of cases outside of South America, Abdoler said there does not appear to be any indication that the transmission methods have changed for the Andes strain.
ABC News medical contributor and epidemiologist Dr. John Brownstein concurred, saying that previous research suggests the hantavirus is a respiratory illness. That means germs can be coughed up, he noted, but it is not an aerosol-based virus.
“It’s not like COVID or measles where it could linger in the air for some time,” he said.
Brownstein added that the incubation period for the virus is long, and despite the lower risk for person-to-person transmission, it is critical that health officials stick to their policies to isolate and monitor anyone connected to the Hondius. Isolation can then be initiated if they become a positive case.
“Incubation can be anywhere from one to eight weeks,” he noted.
During a news briefing Friday, WHO officials stressed that said there is no evidence so far that the virus has changed to become more transmissible or more severe.
Officials said transmission is believed to be based on several factors, including how infectious the patient is, the environment and whether protection and PPE was used.
On Friday, acting Centers for Disease Control and Prevention director Jay Bhattacharya told reporters no cases of hantavirus have been reported in the U.S.
There are now at least 10 cases that have been linked to the ship’s outbreak. Two passengers died from the virus and a third death has been deemed probable by WHO.
Sixteen Hondius passengers, including Kornfeld, initially were flown to the quarantine center at the University of Nebraska Medical Center and had not shown any symptoms as of early Friday. Kornfeld had been placed in a biocontainment unit at the facility.
Two other American passengers were flown to Atlanta for “assessment and care,” according to officials. They were later transferred to the quarantine unit in Nebraska on Friday.
The remainder of the passengers are in quarantine at home and are being monitored.
WHO warned more positive cases could still appear during quarantine because the virus’ incubation period is long, but said that would not necessarily mean the outbreak is growing.
Abdoler noted that the fact that there have not been as many positive cases from the ship and their contacts shows that the data about the Andes transmission is holding up and there are no signs that the virus can spread as easily as other pathogens.
She noted that he is glad that the risk is being taken seriously and that those that have been exposed are being monitored.
“My sense is that there is no really need to panic, but [WHO] is taking a very conservative approach to the outbreak and asking everyone to isolate during the intubation period,” she said.
“I think it is good they are taking a conservative approach because there are unknowns, but I am not personally altering my personal practices of travel or how I go out,” she added.
– ABC News’ Dragana Jovanovic contributed to this report.
Healthcare workers walk outside the Ebola treatment centre in Beni, eastern Democratic Republic of the Congo. (2019). (Photo by Sally Hayden/SOPA Images/LightRocket via Getty Images)
(NEW YORK) – An Ebola outbreak has been confirmed in the Ituri province in Democratic Republic of the Congo, according to Africa Centres for Disease Control and Prevention.
As of the latest update, about 246 suspected cases and 65 deaths have been reported, mainly in Mongwalu and Rwampara health zones, officials said.
Africa CDC said that preliminary lab results from the Institut National de Recherche Biomédicale (INRB) have detected Ebola virus in 13 of 20 samples tested. Four deaths have been reported among laboratory-confirmed cases.
The latest outbreak comes around five months after Congo’s last Ebola outbreak was declared over after more than 40 deaths.
“Africa CDC is closely monitoring the situation and convening an urgent high-level coordination meeting today with the DRC, Uganda, South Sudan and global partners to reinforce cross-border surveillance, preparedness and outbreak response efforts,” officials said in a statement Friday.
-ABC News’ Rashid Haddou contributed to this report
