Epidemiological Evidence for Lineage-Specific Differences in the Risk of Inapparent Chikungunya Virus Infection

Estimate the ratio of symptomatic to asymptomatic CHIKV infections (S:A ratio), elucidate sign and symptom cooccurrence, characterize the probability of infection and disease occurrence across age, identify risk factors associated with infection and disease outcomes, and quantify differences in the proportions of inapparent CHIKV infections between the Asian CHIKV lineage and the ECSA CHIKV lineage