Chikungunya virus infection in Indonesia: a systematic review and evolutionary analysis.

BMC Infect Dis · 2019 · PMC6417237 · PMID 30866835

Europe PMC DOI

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an increasing trendno p-value reported

Interestingly, current studies indicate there is an increasing trend of asymptomatic chikungunya over time [ 7 , 21 , 27 ].

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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.