A Cluster of Dengue Cases in Travelers: A Clinical Series from Thailand.

Trop Med Infect Dis · 2021 · PMC8396219 · PMID 34449752

Europe PMC DOI

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an observed trendno p-value reported

In Thailand, vaccination against dengue is approved, and dengue is holoendemic in the country, with an observed trend of large outbreaks occurring every 4 years.

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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.