A suspected measles case was defined as a subject with fever (≥38°C), generalised rash and at least one of the following symptoms: cough, coryza, or conjunctivitis. A confirmed case was defined either as a laboratory confirmed case (in which measles-specific IgM antibodies were present in serum or saliva samples or measles virus nucleic acid was detected in urine samples by PCR or as a case with an epidemiological link to a confirmed case.