Adults have cross-reactive antibodies to A/California/04/2009 (H1N1)
Does previous exposure to influenza H1N1 viruses, either by infection or vaccination, provide any protection against infection with the new H1N1 influenza virus strains? The answer to this question might provide insight as to why over 60% of confirmed cases of influenza caused by the swine-like H1N1 viruses in the US are in 5- to …
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