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A(H1N1) is a subtype of influenzavirus A and the most common cause of influenza (flu) in humans. Some strains of H1N1 are endemic in humans and cause a small fraction of all influenza-like illness and a large fraction of all seasonal influenza.

In June 2009, WHO declared that flu due to a new strain of swine-origin H1N1 was responsible for the 2009 flu pandemic. This strain is commonly called "swine flu". Symptoms :H1N1 symptoms are like common cold:fever, fatigue, lack of appetite, coughing, runny nose, sore throat, vomiting and diarrhea.Symptoms can develop within one to four days and range from mild to severe.

Novel H1N1 (referred to as “swine flu” early on) is a new influenza virus causing illness in people. This new virus was first detected in people in the United States in April 2009. Other countries, including Mexico and Canada, have reported people sick with this new virus. This virus is spreading from person-to-person, probably in much the same way that regular seasonal influenza viruses spread.

read more http://www.cdc.gov/H1N1flu/qa.htm