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Molecular epidemiology of A/H3N2 and A/H1N1 influenza virus during a single epidemic season in the United States.
- Source :
-
PLoS pathogens [PLoS Pathog] 2008 Aug 22; Vol. 4 (8), pp. e1000133. Date of Electronic Publication: 2008 Aug 22. - Publication Year :
- 2008
-
Abstract
- To determine the spatial and temporal dynamics of influenza A virus during a single epidemic, we examined whole-genome sequences of 284 A/H1N1 and 69 A/H3N2 viruses collected across the continental United States during the 2006-2007 influenza season, representing the largest study of its kind undertaken to date. A phylogenetic analysis revealed that multiple clades of both A/H1N1 and A/H3N2 entered and co-circulated in the United States during this season, even in localities that are distant from major metropolitan areas, and with no clear pattern of spatial spread. In addition, co-circulating clades of the same subtype exchanged genome segments through reassortment, producing both a minor clade of A/H3N2 viruses that appears to have re-acquired sensitivity to the adamantane class of antiviral drugs, as well as a likely antigenically distinct A/H1N1 clade that became globally dominant following this season. Overall, the co-circulation of multiple viral clades during the 2006-2007 epidemic season revealed patterns of spatial spread that are far more complex than observed previously, and suggests a major role for both migration and reassortment in shaping the epidemiological dynamics of human influenza A virus.
Details
- Language :
- English
- ISSN :
- 1553-7374
- Volume :
- 4
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- PLoS pathogens
- Publication Type :
- Academic Journal
- Accession number :
- 18725925
- Full Text :
- https://doi.org/10.1371/journal.ppat.1000133