Influenza

Biography

Biography: Devanshi Gohil

Abstract

Pandemic influenza A (H1N1) 2009 virus was first detected in May 2009 initiating the pandemic in India. Influenza A viruses has the ability to evade the immune response through the acquisition of genetic changes. Understanding the multiple lineages of influenza virus variants is necessary in lieu of co-circulation of influenza A (H1N1) pdm 09 and seasonal influenza A (H3N2) virus in Mumbai, a global transition hub. However, genetic information of circulating influenza strains in Mumbai is limited. In the present study, we performed molecular and evolutionary analysis of these co-circulating viruses isolated from patients with during August 2009 – March 2011. Positive samples were cultured and the viral genomes for HA and NA were analyzed for both seasonal and pandemic isolates. Molecular analysis revealed substantial sequence variations in both pandemic and seasonal influenza A viruses. HA1 sequences of pandemic isolates were conserved at the receptor-binding site, while variations in the amino acid substitutions at the antigenic sites resulted in the changes at the N-linked glycosylation sequon. In pandemic isolates, amino acid substitutions in the NA gene were dissociated with the catalytic or framework sites. Seasonal Influenza A virus exhibited antigenic drift. Phylogenetic analysis of the HA and NA genes of pandemic and seasonal isolates illustrated their evolutionary closeness or drift with their concomitant prototype vaccine strains respectively. Studies like ours aid in identifying the variations in the circulating influenza virus strains, as well as spot emerging variants, thus abetting a vigilant control over the disease.