The 2009 influenza pandemic A(H1N1)pdm09 of swine origin and the continued circulation of highly pathogenic avian H5N1 strain in humans are stark reminders of the unpredictable nature of the ...

Beginning in the 1990s, millions of US pigs were trucked into Mexico, some of which carried classical H1N1 and triple-reassortant H3N2 viruses that then spread across the country’s northern, central, ...

During the last influenza pandemic — the 2009 swine flu outbreak — people under 65 accounted for most of the hospitalizations and deaths. This was a surprising pattern for influenza ...