Colorized transmission electron micrograph of influenza A/H3N2 virus particles, isolated from a patient sample and then propagated in cell culture. Influenza A virus particles adapt shape—as ...

Colored scanning electron micrograph (SEM) of H1N1 influenza (flu) virus particles (pink) budding from lung cells. H1N1 is a subtype of the influenza A virus, ...

The H5N1 avian influenza virus has infected birds and mammals around the world. As of June 2025, 70 people have been infected ...

Colorized transmission electron micrograph of influenza A/H1N1 virus particles. The U.S. Department of Health and Human Services (HHS) and the National Institutes for Health (NIH) today announced ...

Colorized transmission electron micrograph of influenza A/H1N1 virus particles (blue). Influenza A/H1N1 can infect both humans and animals, including birds and pigs, and is one of several strains ...

The ongoing spread of bird flu in the United States has alarmed experts — not just because of human cases causing severe illness, but also due to troubling new instances of infections in cats.

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 is believed to be the most severe type of flu virus for humans, although this is the subject of debate, as there is some evidence to suggest that influenza B might be equally as dangerous.

Two types of influenza viruses are responsible for seasonal flu outbreaks: Influenza A and B. Influenza A accounts for around 75 percent of all cases and tends to cause more severe illness in adults.

The virus causing record cases of avian influenza in birds across the world is changing rapidly, experts have warned, as calls increase for countries to vaccinate their poultry. While emphasizing ...