Spanish flu pandemic was caused by a particularly virulent strain of influenza virus. It infected 500 million people, caused ...
First U.S. detection of virulent H5N9 strain, at a California duck farm, draws scrutiny as evidence of genetic reassortment ...
A California duck farm made headlines this week after the World Organization of Animal Health published a report by U.S.
Spanish flu pandemic was caused by a particularly virulent strain of influenza virus. It infected 500 million people, caused ...