ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins70% CONFIDENCEOverall confidence: 70%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidenceEstimated: SPF's data page says enhanced surveillance 'typically runs from May 1 to November 30'; the 2026 bulletin covers 1 May onward and no 2026 end date is stated.[1]
Santé publique France's enhanced surveillance of chikungunya, dengue, Zika and West Nile normally closes on 30 November; as of 21 September 2026 it counted 13 chikungunya episodes with 90 locally acquired cases, plus 4 dengue episodes with 6 cases.
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