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A respiratory infection, popularly called "swine flu", that involves a new H1N1 type A influenza strain that is a genetic combination of swine, avian and human influenza viruses. It is based primarily on a "triple assortment" virus circulating in U.S. pigs since the mid 1990’s that is, itself, a combination of classical swine flu, a North American avian flu and a strain of human flu. When the strain of swine flu found in pigs in Europe and Asia entered the mix, the two strains swapped genetic material to produce the new H1N1 strain which is transferrable to humans. Person-to-person transmission of the virus can also occur, mainly through the coughing or sneezing of people infected with the influenza virus. The symptoms of H1N1 in people are generally similar to those of regular human seasonal flu and may include fever, lethargy, lack of appetite and coughing. Some people have also reported runny nose, sore throat, nausea, vomiting and diarrhea. Most people recover in a few days to less than two weeks. People age 65 years and older, people of any age with chronic medical conditions (such as asthma, diabetes, or heart disease), pregnant women, and young children are more likely to get complications from influenza.