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What Is Swine Flu H1N1, Swine Flu Epidemic, Swine Flu Pandemic Swine Flu is a respiratory disease, caused by a tiny spheroid virus that belongs to the Influenza A virus group (known as H1N1) that is capable of infecting humans, birds and pigs. It is contagious and can be passed from one species (e.g., birds) through an intermediate animal host (e.g., pigs) to a third species (e.g., humans).
