Like humans, pigs get the flu. They develop a sudden fever, a barking cough, sneezing, lethargy and typically lose their appetite.
Pigs usually don't die from swine flu; their flu viruses cause high levels of illness but low death rates.
Swine influenza viruses circulate among pigs throughout the year, but most outbreaks occur during the late fall and winter, just like with outbreaks in humans.
Most swine flu viruses belong to the Influenza A H1N1 and H3N2 subtypes.
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