Medical professionals believe the train derailment in East Palestine, Ohio, is behind a number of health issues residents are now experiencing, NBC News reported Feb. 25. 

A rise in the infection rate of antibiotic-resistant Shigella has prompted the CDC to issue a health advisory.

The U.S. Energy Department has zeroed in on a laboratory leak as the most likely cause of the COVID-19 pandemic, though officials said the conclusion was made with "low confidence," The Wall Street Journal reported Feb. 26.

Health officials have identified two human avian flu infections among a family in Cambodia, the World Health Organization confirmed Feb. 24.

Overall, COVID-19 hospitalizations are decreasing nationwide. However, nearly half of states are seeing an increase, according to data tracked by The New York Times. 

Two adults over 60 developed Guillain-Barre syndrome after receiving Pfizer's respiratory syncytial virus vaccine candidate in a phase 3 trial. Now the FDA is asking the pharmaceutical giant to conduct a safety study.

A Florida man died after being infected with a rare amoeba while practicing daily sinus rinsing with tap water, the CDC told Fox affiliate WFTX.

In a unanimous vote, a CDC advisory panel voted Feb. 22 in favor of recommending mpox vaccination only for at-risk adults. 

Flu activity continues to dwindle nationwide, and although its patterns are hard to predict, experts say there has not been evidence to suggest influenza B will drive a second wave. 

The FDA expanded its recall for eye drops potentially contaminated with a highly drug-resistant bacteria that has hospitalized 16 and blinded six patients, CBS News reported Feb. 22.

The CDC is sending epidemiologists and environmental health scientists to the area in Ohio where a train derailed in early February, Politico reported Feb. 21.

Norovirus rates continue to climb after the CDC recently reported 15 percent of test results for the virus are coming back positive nationwide — the highest rate since March, ABC News reported Feb. 10.

A large, seven-year study found 20 minutes of daily exercise reduced hospitalizations from 4 percent to 23 percent for different conditions, U.S. News and World Report reported Feb. 20.

The Pennsylvania Department of Health is suing Spotlight PA after the publication requested information about how patients obtain medical marijuana cards, PBS affiliate WHYY reported Feb. 16.

A Norfolk Southern freight train transporting six hazardous industrial chemicals derailed Feb. 3 in East Palestine, Ohio, leading to concerns of long-term contamination.

A new study published in The Lancet found immunity acquired from a COVID-19 infection reduced the risk of hospitalization and death from reinfection at levels that are "at least as high, if not higher," than two vaccine doses. Still, experts caution vaccination is the safest path to protection against severe disease. 

National data tracked by The New York Times indicates the U.S. may see an increase in COVID-19 cases in the coming weeks as test positivity rates rise and more states report a boost in admissions.

The CDC and FDA are investigating a multistate outbreak of Listeria monocytogenes bacteria, Food Safety News reported Feb. 16.

The Biden administration is weighing a tentative plan that would ensure COVID-19 vaccines, treatments and tests remain free for uninsured individuals into 2024, according to a Feb. 16 report from Politico.

Health officials are responding to a rare outbreak of Marburg virus in Equatorial Guinea, the World Health Organization said Feb. 13. The virus, a relative of Ebola, has no known treatments or cures.