Which is the pandemic strain of influenza -

Ans. is 'a' i.e., H1N1 Pandemic influenza A(H1N1)2009o The pandemic influenza A (HsN| ) 2009 virus differs in its pathogenicity from seasonal influenza in two key aspects.i) First, as the majority of human population has little or no pre-existing immunity to the virus, the impact of the infection has been in a wider age range, in particular among children and young adults,ii) Secondly, the virus can infect the lower respiratory tract and can cause rapidly progressive pneumonia, especially in children and young to middle-aged adults,o On 26 September 2011 WHO has adapted a newr nomenclature as influenza A (HjNi) pdm 09.