An affordable, highly immunogenic Neisseria meningitidis serogroup A meningococcal conjugate vaccine (PsA—TT) was licensed for use in sub-Saharan Africa in 2009. In 2010, Burkina Faso became the first country to implement a national prevention campaign, vaccinating 11·4 million people aged 1—29 years. The researchers analysed national surveillance data around PsA—TT introduction to investigate the early effect of the vaccine on meningitis incidence and epidemics.

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