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Comparative Study
. 2009 Nov 19;14(46):19409.

Differentiation of two distinct clusters among currently circulating influenza A(H1N1)v viruses, March-September 2009

Affiliations
  • PMID: 19941799
Free article
Comparative Study

Differentiation of two distinct clusters among currently circulating influenza A(H1N1)v viruses, March-September 2009

S R Fereidouni et al. Euro Surveill. .
Free article

Abstract

Analysis of all complete genome sequences of the pandemic influenza A(H1N1)v virus available as of 10 September 2009 revealed that two closely related but distinct clusters were circulating in most of the affected countries at the same time. The characteristic differences are located in genes encoding the two surface proteins - haemagglutinin and neuraminidase - and four internal proteins - the polymerase PB2 subunit, nucleoprotein, matrix protein M1 and the non-structural protein NS1. Phylogenetic inference was demonstrated by neighbour joining, maximum likelihood and Bayesian trees analyses of the involved genes and by tree construction of concatenated sequences.

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