[Typing of hemorrhagic fever with renal syndrome by cluster analysis].

Objective: To make an inquiry into method of typing of hemorrhagic fever with renal syndrome (HFRS).

Method: Average monthly rates were calculated on the basis of data from 1995 to 1999, then cluster analysis was carried out to type out endemic areas.

Results: Compared with the results of 36 surveillance spots from 1980 to 1992, twenty-four surveillance spots had the same results (66.7%). Twenty-three surveillance spots had the same results with the original data in 1999 (82.1%).

Conclusion: HFRS incidences increased in spring or in summer, but decreased in autumn or in winter. Cluster analysis seemed to be a supplementary method in distinguishing the epidemic types for HFRS.