Influenza A(H1N1)2009 strain caused pandemics worlwide has been introduced in October 2009 into Mongolia and replaced by influenza B virus in February 2010 and A(H3N2) virus in October 2010. A new variant of pandemic A(H1N1) virus has been revealed in Mongolia in January 2011 and has been in a short circulation causing a minor epidemics. All 8 segments of a representative strain of this virus have been sequenced fully and deposited into GenBank. The study is continuing.