Epidemiological features of epidemic Japanese encephalitis in Hubei in 1951～2006

Objective To understand the epidemic situation of Japanese B encephalitis(JE) in Hubei and provide scientific basis for controlling JE in the future.Methods The data of JE from NNDRS and surveillance spots in Hubei was analyzed by Excel 2003.Results The accumulative total JE cases was 130 304 and 16 227 deaths.The annual average incidence flunctuated from 0.14/100 000 to 33.69/100 000 and it was higher in the west mountainous areas in this province..High peak period was from July to August.The retios of male to female was 1.77 : 1.Scattered living children was accounted for 59.49% and students 34.24%.Mosquito density increased since June and the peak was in September.The average positive rate of serum antibody IgG in pigs was 72.19%,and that in health population was 35%.The rate of clinical laboratory diagnosis was of JE cases was 50%.Conclusion The change of epidemic trend and areas was associated with JE vaccine immunization.The work of surveillance and forecast should be strengthened and vaccination of the children under 10 years old and control of mosuitoes are the main preventive strategy.