
2009 H1N1 Flu (Swine Flu) and You
2009 H1N1 (sometimes called “swine flu”) is a new influenza virus
causing illness in people. This new virus was first detected in people
in the United States in April 2009. This virus is spreading from
person-to-person worldwide, probably in much the same way that regular
seasonal influenza viruses spread. On June 11, 2009, the
World Health Organization
(WHO) signaled that a pandemic of 2009 H1N1 flu was underway.
Why is 2009 H1N1 virus sometimes called “swine flu”?
This virus was originally referred to as “swine flu” because laboratory
testing showed that many of the genes in this new virus were very
similar to influenza viruses that normally occur in pigs (swine) in
North America. But further study has shown that this new virus is very
different from what normally circulates in North American pigs. It has
two genes from flu viruses that normally circulate in pigs in Europe
and Asia and bird (avian) genes and human genes. Scientists call this a
"quadruple reassortant" virus.