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Possible case NA
Probable case
Any person meeting the clinical criteria and the laboratory criteria for a probable case,
OR
Any person meeting the clinical criteria with an epidemiological link
Confirmed case
Any person meeting the clinical and laboratory criteria for case confirmation
Note: Serological results should be interpreted according to previous exposure to other flaviviral infections and the flavivirus vaccination status. Confirmed cases in such situations should be validated by serum neutralization assay or other equivalent assays.U.K.