What are the signs to indicate swine flu in pigs?

Signs of swine flu in pigs can include fever, depression, coughing (barking), discharge from the nose or eyes, sneezing, breathing difficulties, eye redness or inflammation, and going off feed. Some pigs infected with influenza, however, may show no signs of illness at all.

Source: Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (NCIRD)