Pandemic 2009 H1N1 vaccine protects against 1918 Spanish influenza virus.
The 1918 influenza A virus caused the most devastating pandemic, killing approximately 50 million people worldwide. Immunization with 1918-like and classical swine H1N1 virus vaccines results in cross-protective antibodies against the 2009 H1N1 pandemic influenza, indicating antigenic similarities among these viruses. In this study, we demonstrate that vaccination with the 2009 pandemic H1N1 vaccine elicits 1918 virus cross-protective antibodies in mice and humans, and that vaccination or passive transfer of human-positive sera reduced morbidity and conferred full protection from lethal challenge with the 1918 virus in mice. The spread of the 2009 H1N1 influenza virus in the population worldwide, in addition to the large number of individuals already vaccinated, suggests that a large proportion of the population now have cross-protective antibodies against the 1918 virus, greatly alleviating concerns and fears regarding the accidental exposure/release of the 1918 virus from the laboratory and the use of the virus as a bioterrorist agent.
Department of Microbiology, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029, USA.
Rafael A
RA
Medina
Balaji
B
Manicassamy
Silke
S
Stertz
Christopher W
CW
Seibert
Rong
R
Hai
Robert B
RB
Belshe
Sharon E
SE
Frey
Christopher F
CF
Basler
Peter
P
Palese
Adolfo
A
García-Sastre
D000818:Animals; D056738:Cross Protection / Q000276:immunology; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D009975:Orthomyxoviridae / Q000276:immunology*
D007252:Influenza Vaccines