How Swine Flu Spreads in Humans - from the U.S. Centers for Disease Control and Prevention
* Swine flu viruses typically cause illness in pigs, not humans. Most cases occur when people come into contact with infected pigs or contaminated objects moving between people and pigs.

*Transmission from human to human is thought to occur in the same way as with seasonal flu -- by touching something contaminated with flu viruses and then touching one's mouth or nose, and through coughing or sneezing. One of the most effective prevention measures is regular hand washing.

* Symptoms of swine flu in people are similar to those of seasonal influenza -- sudden fever, coughing, muscle aches and extreme fatigue. This new strain also appears to cause more diarrhea and vomiting than normal flu.
* Vaccines are available to be given to pigs to prevent swine influenza. There is no vaccine to protect humans from swine flu, although the CDC is formulating one. The seasonal influenza vaccine may help to provide partial protection against swine H3N2, but not against swine H1N1 viruses like the one circulating now.
* People cannot catch swine flu from eating pork or pork products. Cooking pork to an internal temperature of 160 degrees Fahrenheit (71 degrees Celsius) kills the swine flu virus along with other bacteria and viruses.