Reduction in Invasive Pneumococcal Disease Following Implementation of the Conjugate Vaccine in the Oxfordshire Region, England.

06:00 EDT 25th September 2010 | BioPortfolio

Summary of "Reduction in Invasive Pneumococcal Disease Following Implementation of the Conjugate Vaccine in the Oxfordshire Region, England."

Pneumococcal conjugate vaccine to 7 capsular types has been highly effective in the US since its introduction in 2000. The same vaccine was adopted by the UK in 2006. Ongoing surveillance since 1995 of invasive pneumococcal disease in Oxfordshire, UK, allowed assessment of the impact of vaccine intervention. The vaccine significantly reduced invasive pneumococcal disease among the target group, children less than 2 years; incidence rate ratio (IRR)=0.62 [95%CI 0.43-0.90] (p=0.008) comparing the 3 years pre- and post-implementation with a residual incidence of 22.4/100,000 children. The reduction was even greater when comparing 11 years pre with the 3 years post implementation of vaccine; IRR=0.53 [0.39- 0.70] p<0.0001. There was a marked direct effect of the vaccine evidenced by substantial reductions in the 7 serotypes contained in the vaccine. There was also a clear reduction in invasive pneumococcal disease for those serotypes contained in the vaccine among those older than 2 years when comparing both the 3 and 11 year pre PCV7 time periods with IRR=0.57 [0.47-0.69] p<0.0001 and IRR=0.50 [0.43-0.58] p<0.0001 respectively, indicating a strong herd effect. There was a significant, though moderate, rise in the serotypes not contained in the vaccine, with clear evidence for replacement in some serotypes.


1 University of Oxford;

Journal Details

This article was published in the following journal.

Name: Journal of medical microbiology
ISSN: 1473-5644


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Relevant Topic

A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe, its toxins or one ...

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