Report of a pertussis outbreak in a low coverage booster vaccination group of otherwise healthy children in Italy.

BMC Infect Dis · 2013 · PMC4225753 · PMID 24225304

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an increasing trendno p-value reported

Although decreasing trends have been observed in England and Wales, Ireland, Sweden and Spain [ 9 - 12 ] large outbreaks occurred in the Netherlands and Switzerland, and an increasing trend has been observed in Norway [ 13 - 19 ].

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