Acellular pertussis vaccines and pertussis resurgence: revise or replace?

mBio · 2014 · PMC4056554 · PMID 24917600

Europe PMC DOI

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showed a trendno p-value reported

In fact, 5 years after primary vaccination with 2- or 3-component aP vaccines, the children immunized with the 3-component vaccine showed a trend to a longer persistence of anti-PT IgG after the preschool boost compared with the recipients of the 2-component vaccine ( 18 ).

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.