New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

Flu Shot in Pregnancy Tied to Fewer Infections in Young Infants — Protection appeared greatest when vaccination occurred in the second or third trimesters ...

A lab confirmed via genetic analysis that a patient in Mexico was infected with a bird flu strain not found before in humans, according to the WHO.

The document notes that the delta variant, which was first detected in India, causes infections that are more contagious than the common cold, flu, smallpox and Ebola virus.

Read current news and medical research on influenza A, influenza B, including symptoms, vaccines and treatments for flu viruses.

While the Covid-19 pandemic is firmly in the past for many Americans, US households continue to bear the costs of infectious-disease outbreaks. A few months ago, the price of eggs ...

The Food and Drug Administration on Wednesday approved a twice-yearly injection that provided a near-perfect shield against H.I.V. infection in clinical trials. The approval is among the most ...

The tracker assumes the General Assembly finished its work for the year June 21. It lawmakers return for a special session in the fall, "dead" bills could theoretically be revived. This story will be ...

The fifth Symposium on Infectious Disease in the Immunocompromised Host convened in Seattle last month. Experts and rising stars in the field met to share practice-changing research, discuss tricky ...

CBS News is tracking a outbreak of measles in West Texas that has led to the deaths of two children and a growing number of cases around the country.