title: [Typing of hemorrhagic fever with renal syndrome by cluster analysis].
abstract: OBJECTIVE
  To make an inquiry into method of typing of hemorrhagic fever with renal syndrome (HFRS).
  
  
  METHODS
  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%).
  
  
  CONCLUSIONS
  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.
authors.affiliation: Institute of Microbiology and Epidemiology, Academy of Military Medical Sciences, Beijing 100071, China.
authors.forename: Xiu-hua
authors.initials: XH
authors.lastname: Guo
authors.forename: Wu-chun
authors.initials: WC
authors.lastname: Cao
authors.forename: Liang-ping
authors.initials: LP
authors.lastname: Hu
authors.forename: Shi-guo
authors.initials: SG
authors.lastname: Zhou
authors.forename: Xi-tan
authors.initials: XT
authors.lastname: Zhang
authors.forename: Hua-xin
authors.initials: HX
authors.lastname: Chen
mesh_terms: D000818:Animals; D002681:China / Q000453:epidemiology; D016000:Cluster Analysis; D004197:Disease Reservoirs; D018063:Hantaan virus / Q000302:isolation & purification; D006480:Hemorrhagic Fever with Renal Syndrome / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D011156:Population Density; D012621:Seasons; D018571:Sentinel Surveillance