Does the economic recession influence the incidence of pertussis in a cosmopolitan European city?

BMC Public Health · 2019 · PMC6360796 · PMID 30717741

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an increasing trendno p-value reported

Despite the periodicity of the disease we can see in other studies that the last epidemic wave of pertussis shows an increasing trend of the disease [ 6 , 14 , 17 ].

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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.