What is the time period for which someone with H1N1 infection remains infective? From the time they get symptoms of flu, from the time they start treatment for flu, or 1 or 2 sometimes even 5 days before they start symptoms to 7 to even 10 days after the become totally asymptomatic?

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Four to five days, maybe more, according to this source. To diagnose H1N1 Influenza A infection, a respiratory specimen would generally need to be collected within the first four to five days of illness (the most infectious stage), however, some people, especially children, maybe contagious for seven days or longer. http://www.parliament.nz/en-NZ/ParlSupport/ResearchPapers/c/1/8/00PLSoc09041-Human-Influenza-A-H1N1-Swine-Flu.htm About half way down the page. Nov 06 09, 10:02 AM