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How can human infections with swine influenza be diagnosed?

Some persons, especially children, may shed virus for 10 days or longer. 

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 U.S. Centers for Disease Control and Prevention reported that to diagnose swine influenza A infection, a respiratory specimen would generally need to be collected within the first 4 to 5 days of illness (when an infected person is most likely to be shedding virus).

However, some persons, especially children, may shed virus for 10 days or longer. Identification as a swine flu influenza A virus requires sending the specimen to CDC for laboratory testing.

How does swine flu spread? Influenza viruses can be directly transmitted from pigs to people and from people to pigs.

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Human infection with flu viruses from pigs are most likely to occur when people are in close proximity to infected pigs, such as in pig barns and livestock exhibits housing pigs at fairs. Human-to-human transmission of swine flu can also occur.

This is thought to occur in the same way as seasonal flu occurs in people, which is mainly person-to-person transmission through coughing or sneezing of people infected with the influenza virus.

People may become infected by touching something with flu viruses on it and then touching their mouth or nose.

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