Table 1. Case definitions for dengue and chikungunya virus infection.

Definition	Dengue	Chikungunya
Suspected case	Fever of 38.5°C or higher and at least one of the following symptoms not explained by other medical conditions: headache, back pain, retro-orbital pain, myalgia, and arthralgia.
Probable case	Suspected case with positive IgM antibodies in a single sample
Confirmed case	Suspected case with at least one of the following biological results: - Positive RT-PCR - seroconversion - positive NS1 test - 4-fold increase in IgG antibodies	Suspected case with at least one of the following biological results: - Positive RT-PCR - seroconversion - 4-fold increase in IgG antibodies
Imported case	Case with travel history in the 15 days before the onset of symptoms in an area known for DENV or CHIKV circulation
Autochthonous case	Case without travel history in the 15 days before the onset of symptoms in an area known for DENV or CHIKV circulation