Question: The virus that causes swine flu, H1N1, originally could only
infect pigs. People
who raised pigs …



The virus that causes swine flu, H1N1, originally could only
infect pigs. People
who raised pigs were exposed to this virus all the time, but the
host range of the virus was
restricted to just pigs. Then all of a sudden, H1N1 gained the
ability to infect humans and the
swine flu pandemic began. As a geneticist, how would you explain
this? You may answer in very
general terms. A full credit answer can be written in one word.

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