Division B Confirmed case

At least one of the following four:

• Isolation of chikungunya virus from a clinical specimen;

• Detection of chikungunya viral nucleic acid from a clinical specimen;

• Detection of chikungunya specific IgM antibodies in a single serum sample AND confirmation by neutralisation;

• Seroconversion or four-fold antibody titre increase of chikungunya specific antibodies in paired serum samples.