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 H5N1 avian flu has impacted more than 160 million birds, resulting in the deaths of 20 million egg-laying chickens since ...

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." ...

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 ...

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 ...

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.

Cases may be milder for a few possible reasons: The virus may have become less virulent over the years, immunity to annual influenza strains may have provided us with some level of protection ...

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

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." ...