Of six that were previously identified, "Hendra virus and Nipah virus are highly virulent emerging pathogens that cause outbreaks in humans and are associated with high case-fatality ratios." The CDC ...

The Nature of Viruses Viruses are microscopic entities that require a host's cellular machinery to replicate. Unlike bacteria, they are not living organisms, which means they cannot reproduce on their ...

New pandemic strains of influenza virus typically are more virulent than those that have been circulating longer, presumably because they present novel antigens to hosts. In this new study ...

Outbreaks of the highly contagious stomach virus are more than double what they were last year, the Centers for Disease Control and Prevention says Cases of norovirus — the virulent, wildly ...

First U.S. detection of virulent H5N9 strain, at a California duck farm, draws scrutiny as evidence of genetic reassortment that could trigger human outbreaks.

The virulent illness spreads easily in close quarters ... at least 28 people at the Pasadena Evacuation Shelter are reported to have the virus, the Pasadena Department of Public Health confirmed.

Reports of wild bird deaths continue to mount, and not just in Illinois. Meanwhile, a vaccine for chickens could be on the ...

"The Chinese poultry lineage may have experienced more vaccine-driven selection compared to other lineages," the researchers wrote.