Swine influenza is a respiratory disease caused by influenza viruses that primarily infect pigs. It can spread to humans, especially those who work closely with pigs. Symptoms in humans may include fever, cough, sore throat, body aches, and fatigue. The virus is typically transmitted through direct contact with infected animals or contaminated environments. While most cases are mild, some can lead to severe illness, particularly in individuals with weakened immune systems. Vaccines are available for both pigs and humans to help prevent outbreaks and reduce the severity of the disease.