Pigs get it all the time. Swine flu is a respiratory disease caused by type A influenza viruses. It’s rare for humans to contract the infection, but it does happen, as we’re seeing around the world now. This particular strain—called H1N1—is especially scary because it is also transmissable between humans through coughing or sneezing. That boosts the chances of an outbreak. The Centers for Disease Control in the U.S., says the best way to avoid getting swine flu is by washing your hands regularly and thoroughly.