USA - Recent results from studies with H1N1 influenza A virus

Limited cross-reactivity of serum samples from pigs infected U.S swine influenza viruses or vaccinated with commercial vaccines was demonstrated against the new S/O H1N1 influenza virus (A/CA/04/2009) as measured by the standard HI test. The results of this experiment suggest that pre-existing immunity induced by swine influenza viruses circulating in the U.S may not protect pigs against the new S/O H1N1 influenza virus presently circulating in people. Importantly, vaccines currently used to protect pigs in U.S swine operations against swine influenza virus may not be effective against the new S/O H1N1 influenza virus.
Tuesday 2 June 2009 (8 years 8 months 17 days ago)
Limited cross-reactivity of serum samples from pigs infected U.S swine influenza viruses or vaccinated with commercial vaccines was demonstrated against the new S/O H1N1 influenza virus (A/CA/04/2009) as measured by the standard HI test. The results of this experiment suggest that pre-existing immunity induced by swine influenza viruses circulating in the U.S may not protect pigs against the new S/O H1N1 influenza virus presently circulating in people.

Importantly, vaccines currently used to protect pigs in U.S swine operations against swine influenza virus may not be effective against the new S/O H1N1 influenza virus.

http://www.ars.usda.gov/2009H1N1/SwineRecentResults.pdf

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