[Demonstration for periodicity of leptospirosis in Yichang City of Hubei Province during 1960-1997].

OBJECTIVE

To study the periodicity of leptospirosis incidence.

METHODS

Data of leptospirosis epidemics in Yichang City collected during the past 38 years from 1960 to 1997 were analyzed with periodic graphics method.

RESULTS

Cause-specific incidence rate of leptospirosis was 15.43 per 100,000 in average, with an epidemic interval of 10 years, with statistical significance in periodic vibration (J = 4.179, P < 0.05).

CONCLUSION

The results mentioned above provided scientific basis for the effective control and prevention of the disease.