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Surveillance and outbreak reports Open Access
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Abstract

Data collected over winter 2009 by five World Health Organisation National Influenza Centres in the southern hemisphere were used to examine the circulation of pandemic and seasonal influenza A strains during the first pandemic wave in the southern hemisphere. There is compelling evidence that the pandemic influenza A(H1N1) 2009 virus significantly displaced seasonal influenza A(H1N1) and, to a lesser extent, A(H3N2) viruses circulating in the southern hemisphere. Complete replacement of seasonal influenza A strains, however, was not observed during the first pandemic wave.

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/content/10.2807/ese.15.31.19631-en
2010-08-05
2024-03-29
http://instance.metastore.ingenta.com/content/10.2807/ese.15.31.19631-en
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