How are human infections with swine influenza diagnosed?

•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 a hospital laboratory for testing.