but we also know that the strain of influenza virus that entered pigs in 1918 then circulated in them for over 90 years before combining with other viruses to cause the 2009 swine flu pandemic.

Dozens of researchers, including myself, worked for years to uncover that swine flu had leapt to humans from a pig in Mexico in 2009. We learned a lot about influenza evolution, pig farming, and ...

Seven years of surveillance and research revealed the complex history of the H1N1 virus that leapt from pigs to humans and sparked the global swine flu outbreak. Martha Nelson is an evolutionary ...

Swine flu, a type of influenza caused by a new strain of the H1N1 Type A influenza virus has originated from the pigs. Winter always brings along the chills and the flu, make sure you're safe this ...