According to the CDC, the virus is an influenza A virus, carrying the designation H1N1. It contains DNA from avian, swine and human viruses, including elements from European and Asian swine viruses. Swine flu symptoms are claimed to include fever, lethargy, lack of appetite and coughing. Some people who have contracted the virus have also reported runny nose, sore throat, nausea, vomiting and diarrhea.