H2N2V1, Main, Exploration, bibRecord, 000E36

Prior infection with classical swine H1N1 influenza viruses is associated with protective immunity to the 2009 pandemic H1N1 virus

Identifieur interne : 000E36 ( Main/Exploration ); précédent : 000E35; suivant : 000E37

Prior infection with classical swine H1N1 influenza viruses is associated with protective immunity to the 2009 pandemic H1N1 virus

Auteurs : John C. Kash ; Li Qi ; Vivien G. Dugan ; Brett W. Jagger ; Rachel J. Hrabal ; Matthew J. Memoli ; David M. Morens ; Jeffery K. Taubenberger

Source :

Influenza and Other Respiratory Viruses [ 1750-2640 ] ; 2010.

RBID : PMC:2859467

Abstract

Please cite this paper as: Kash et al. (2010) Prior infection with classical swine H1N1 influenza viruses is associated with protective immunity to the 2009 pandemic H1N1 virus. Influenza and Other Respiratory Viruses 4(3), 121–127.

Background The 2009 H1N1 pandemic emerged even though seasonal H1N1 viruses have circulated for decades. Epidemio‐logical evidence suggested that the current seasonal vaccine did not offer significant protection from the novel pandemic, and that people over the age of 50 might were less susceptible to infection.

Objectives In a mouse challenge study with the 2009 pandemic H1N1 virus, we evaluated protective immune responses elicited by prior infection with human and swine influenza A viruses.

Results Mice infected with A/Mexico/4108/2009 (Mex09) showed significant weight loss and 40% mortality. Prior infection with a 1976 classical swine H1N1 virus resulted in complete protection from Mex09 challenge. Prior infection with either a 2009 or a 1940 seasonal H1N1 influenza virus provided partial protection and a >100‐fold reduction in viral lung titers at day 4 post‐infection.

Conclusions These findings indicate that in experimental animals recently induced immunity to 1918‐derived H1N1 seasonal influenza viruses, and to a 1976 swine influenza virus, afford a degree of protection against the 2009 pandemic virus. Implications of these findings are discussed in the context of accumulating data suggesting partial protection of older persons during the 2009 pandemic.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2859467

DOI: 10.1111/j.1750-2659.2010.00132.x
PubMed: 20409208
PubMed Central: 2859467

Affiliations:

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<front><div type="abstract" xml:lang="en"><p><italic>Please cite this paper as:</italic>
 Kash <italic>et al.</italic>
 (2010) Prior infection with classical swine H1N1 influenza viruses is associated with protective immunity to the 2009 pandemic H1N1 virus. Influenza and Other Respiratory Viruses 4(3), 121–127.</p>
<p><bold>Background </bold>
 The 2009 H1N1 pandemic emerged even though seasonal H1N1 viruses have circulated for decades. Epidemio‐logical evidence suggested that the current seasonal vaccine did not offer significant protection from the novel pandemic, and that people over the age of 50 might were less susceptible to infection.</p>
<p><bold>Objectives </bold>
 In a mouse challenge study with the 2009 pandemic H1N1 virus, we evaluated protective immune responses elicited by prior infection with human and swine influenza A viruses.</p>
<p><bold>Results </bold>
 Mice infected with A/Mexico/4108/2009 (Mex09) showed significant weight loss and 40% mortality. Prior infection with a 1976 classical swine H1N1 virus resulted in complete protection from Mex09 challenge. Prior infection with either a 2009 or a 1940 seasonal H1N1 influenza virus provided partial protection and a >100‐fold reduction in viral lung titers at day 4 post‐infection.</p>
<p><bold>Conclusions </bold>
 These findings indicate that in experimental animals recently induced immunity to 1918‐derived H1N1 seasonal influenza viruses, and to a 1976 swine influenza virus, afford a degree of protection against the 2009 pandemic virus. Implications of these findings are discussed in the context of accumulating data suggesting partial protection of older persons during the 2009 pandemic.</p>
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Prior infection with classical swine H1N1 influenza viruses is associated with protective immunity to the 2009 pandemic H1N1 virus

Prior infection with classical swine H1N1 influenza viruses is associated with protective immunity to the 2009 pandemic H1N1 virus

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