The flu virus is changing in ways never seen before, increasing infections and raising concerns about vaccine effectiveness ...

Flu A and flu B are two different strains of influenza, explains Thomas Russo, M.D., professor and chief of infectious ...

In the United States, flu shots are updated annually to include multiple types of influenza A and B viruses; scientists pick strains of the viruses expected to be dominant that year.

All age groups in the United States are experiencing a "high severity" of influenza cases among all age groups for the first ...

but influenza A is the dominant version of influenza infecting people right now.” Both types spread the same way, cause ...

A new study says the flu A viral strain can adapt shape to stay infectious. Infectious disease doctors break down what this ...

The Centers for Disease Control and Prevention has confirmed a third U.S. bird flu hospitalization, Wyoming's health ...

Federal health officials say a dairy worker in Nevada has been infected with a new type of bird flu that’s different from the ...

Influenza A virus particles strategically adapt their shape -- to become either spheres or larger filaments -- to favor their ability to infect cells depending on environmental conditions, according ...

Influenza A Viruses Adapt Shape in Response to Environmental Pressures - NIH Study Identifies Previously Unknown Adaptation ...

The CDC confirmed a case of a new strain of bird flu in a dairy worker who contracted the virus from infected cows on a ...

A second type of bird flu has been found in U.S. dairy cows for the first time, the U.S. Department of Agriculture announced.