Definition and more info at link;
Swine influenza
http://en.wikipedia.org/wiki/Swine_flu
Swine flu infects people every year and is found typically in people who have been in contact with pigs, although there have been cases of person-to-person transmission.[2] Symptoms include fever, disorientation, stiffness of the joints, vomiting, and loss of consciousness ending in death.[3] Swine influenza is known to be caused by influenza A subtypes
Pigs can harbor influenza viruses adapted to humans and others that are adapted to birds, allowing the viruses to exchange genes and create a pandemic strain.
You need pigs, chickens, and humans living under the same roof...literally. Crazy as that sounds, it was done in the poorest regions of china and south east asia...maybe it still is.
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Assume this will wipe out all of Congress. Of course, they will get any of the vaccine first to save the rest of us!