tetano
Editor, Senior Moderator
Citation: Puleston R, Bugg G, Hoschler K, Konje J, Thornton J, et al. (2013) Multi-Centre Observational Study of Transplacental Transmission of Influenza Antibodies following Vaccination with AS03A-Adjuvanted H1N1 2009 Vaccine. PLoS ONE 8(1): e47448. doi:10.1371/journal.pone.0047448
Introduction
Illness and death from influenza increase during pregnancy. In the United Kingdom pregnant women were targeted in a national programme for vaccination during the H1N1 2009?10 pandemic.
Methods
In this study, pregnant women were recruited in labour from November 9, 2009 to March 10, 2010. Pandemic vaccination status was determined. Venous cord blood collected at delivery was evaluated for transplacental transfer of antibodies by measurement of haemagglutination inhibition and microneutralization titres.
Results
Samples were collected from 77 vaccinated and 27 unvaccinated women. Seroprotection (HI titre ≥1:40) was detected in 58 (75.3%, 95% CI 64.2?84.4) cord blood samples from vaccinated women and 5 (18.5%, 95% CI 6.3?38.1) from unvaccinated women (P<0.0001). There was evidence of transplacental seroprotection 8 days after maternal immunization (77.9%, 95 CI 66.2?87.1), maintained in most cases for at least 16 weeks.
Discussion
Immunization of pregnant women with AS03A-adjuvanted vaccine is followed by transplacental transfer of passive immunity at titres consistent with clinical protection in three-quarters of new-born infants. The findings support national and international pandemic H1N1 2009 recommendations for immunization during pregnancy.
http://www.plosone.org/article/info...8;jsessionid=1C499237E56E5530B7AB8E8046DA1D46
Introduction
Illness and death from influenza increase during pregnancy. In the United Kingdom pregnant women were targeted in a national programme for vaccination during the H1N1 2009?10 pandemic.
Methods
In this study, pregnant women were recruited in labour from November 9, 2009 to March 10, 2010. Pandemic vaccination status was determined. Venous cord blood collected at delivery was evaluated for transplacental transfer of antibodies by measurement of haemagglutination inhibition and microneutralization titres.
Results
Samples were collected from 77 vaccinated and 27 unvaccinated women. Seroprotection (HI titre ≥1:40) was detected in 58 (75.3%, 95% CI 64.2?84.4) cord blood samples from vaccinated women and 5 (18.5%, 95% CI 6.3?38.1) from unvaccinated women (P<0.0001). There was evidence of transplacental seroprotection 8 days after maternal immunization (77.9%, 95 CI 66.2?87.1), maintained in most cases for at least 16 weeks.
Discussion
Immunization of pregnant women with AS03A-adjuvanted vaccine is followed by transplacental transfer of passive immunity at titres consistent with clinical protection in three-quarters of new-born infants. The findings support national and international pandemic H1N1 2009 recommendations for immunization during pregnancy.
http://www.plosone.org/article/info...8;jsessionid=1C499237E56E5530B7AB8E8046DA1D46