pandemic influenza a (h1n1) 2009 in india: duration of virus shedding in patients under antiviral treatment. | national centre for disease control (ncdc), delhi, is a national nodal centre for surveillance of pandemic influenza a (h1n1) in india. the present study was undertaken to see the period of infectivity in positive cases undergoing antiviral therapy. | 2011 | 21304193 |