[Serological survey of pandemic influenza A (H1N1) virus infection among population in Hunan Province].

Objective: To understand the infection condition and analytical methods of Influenza A (H1N1) virus in the population of Hunan Province during different periods.

Methods: Quick surveys on the positive rate of Influenza A (H1N1) virus hemagglutination inhibition (HI) test have been conducted for 5 times successively from November 2009 to March 2010 in 14 medical and health institutions of Changsha city, whose results were then compared with those from the sampling surveys of whole Hunan province.

Results: 2131 subjects were involved in this study; the total population standardized rates of antibody positive investigated for 5 times were 9.