[Seasonal migration: a case control study of malaria prevention in Sabah].

Malaria is an infectious disease that remains the main health problem in Tawau, Sabah. A case control study was carried out in the district to determine the influence of seasonal migration on malaria occurrence. Respondents consisted of 142 cases who were randomly selected from the reported cases in 1996 and they were pair-matched with 142 controls from the same villages by age and sex. The results showed that malaria occurrence was significantly associated with movement to the jungle, use of preventive measures during migration and frequency of using treated bednets (p < 0.05). The risk of individuals migrated to the jungle was 6 times as compared to those who do not (unadjusted Odd Ratio = 5.50, 95% CI 1.16-35.89) and they were more likely to get the infection if they did not use bednets (OR = 3.57, 95% CI 1.57-9.06). Health promotion campaign on the use of bednets especially during short term migration should be given priority in any malarial intervention program.