Chikungunya: important lessons from the Jamaican experience.

Area of Science:

• Epidemiology
• Infectious Diseases
• Public Health

Background:

• Chikungunya virus (CHIKV) infection is a significant public health concern, particularly during outbreaks.
• Accurate identification of CHIKV cases is crucial for effective disease surveillance and control.

Purpose of the Study:

• To characterize the clinical presentation of CHIKV illness in adults during the 2014 Jamaican outbreak.
• To evaluate the predictive accuracy of the existing CHIKV case definition.

Main Methods:

• A cross-sectional study analyzed clinical data from suspected CHIKV cases reported to the Ministry of Health.
• Health charts of individuals over 15 years old presenting with suspected CHIKV or "acute viral illness" were reviewed.
• Data included demographics, clinical symptoms, and laboratory results.

Main Results:

• Jamaica reported 4,447 CHIKV notifications in 2014.
• PCR confirmed CHIKV in 65% of 137 tested suspected cases.
• Arthralgia (86%) and fever (76%) were the most common symptoms. Only 34% of cases meeting the epidemiologic definition were recorded as CHIKV; "acute viral illness" was more common.

Conclusions:

• The current epidemiologic case definition for CHIKV may not be sufficiently sensitive for identifying cases during an outbreak.
• Revised, broader case definitions could improve case ascertainment.
• Standardized data collection and validation of case definitions are recommended for future CHIKV surveillance.