How can human infections with Influenza A (H1N1-2009) be diagnosed?
To diagnose Influenza A (H1N1-2009), 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 the virus). However, some persons, especially those who are immuno-compromised may shed the virus for 10 days or longer.
