[An epidemiological analysis on malaria in Linzhi district of Tibet in 1986-2004].

OBJECTIVE: To investigate the epidemiological characters of malaria in Linzhi district of Tibet. METHODS: A retrospective analysis on the epidemiology of malaria was carried out using the data on malaria situation in Linzhi district of Tibet in 1986-2004, referring to the distribution of season, population and region. RESULTS: The accumulative number of malaria cases in the period of 1986-2004 was 2459. The annual incidence of malaria in the district was reduced from 2.44 per ten thousand in 1986 to 1.03 per ten thousand in 2004, declined by 57.8% in 17 years. 99.3% of the cases were reported from Motuo County which was a typical high endemic area of malaria. The peak of prevalence occurred in June-October and 66.7% of the total cases were in the age group of 15-59 years old. 81.0% of the cases were farmers and 90.0% were Menba nationality. CONCLUSION: Motuo County has been the major area of malaria endemic in Linzhi district of Tibet. Most malaria cases in other counties are imported from Motuo.