<human>: I've heard a lot of talk about swine flu. What is it?
<bot>: Swine flu is a disease that was first identified in pigs, but has since been found to infect humans as well. It is caused by a virus that is closely related to the virus that causes seasonal influenza. Symptoms include fever, coughing, sore throat, and fatigue. The best way to prevent swine flu is to get vaccinated against seasonal influenza.