title: [Seasonality of clustering of fever and diarrhea in Beijing, 2009-2015].
abstract: Objective:To understand the seasonal distribution of the clustering of fever and diarrhea.Methods:Concentration degree and circular distribution methods were used to analyze the seasonal distribution of the clustering of fever and diarrhea in Beijing from 2009 to 2015. The information were collected from the Infectious Disease Surveillance Information System of Beijing.Results:TheMvalues of the clustering of fever and diarrhea were 0.57 and 0.47. Circular distribution results showed that the clustering of fever and diarrhea angle dispersion indexRvalues were 0.57 and 0.46 respectively, the sample average angle of Rayleigh' s testZvalues were 414.14, 148.09 respectively (allP<0.01). The clustering of fever and diarrhea had seasonality. The incidence peak of fever was on October 13, and the epidemic period was during August 13-December 14. The incidence peak of diarrhea was on July 31, and the epidemic period was during May 20-October 11.Conclusion:The clustering of fever had obvious seasonality in Beijing, which mainly occurred in autumn and winter. The cluster of diarrhea had certain seasonality, which mainly occurred in summer and autumn.
authors.affiliation: Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: X T
authors.initials: XT
authors.lastname: Li
authors.affiliation: Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: Y W
authors.initials: YW
authors.lastname: Chen
authors.affiliation: Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: He
authors.affiliation: Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: S
authors.initials: S
authors.lastname: Li
authors.affiliation: Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Gao
authors.affiliation: Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: X
authors.initials: X
authors.lastname: He
authors.affiliation: Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Control and Prevention, Beijing 100013, China.
authors.forename: Q Y
authors.initials: QY
authors.lastname: Wang
mesh_terms: D000068476:Beijing; D016000:Cluster Analysis; D003967:Diarrhea / Q000453:epidemiology*; D058872:Epidemics; D005334:Fever / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D011159:Population Surveillance; D012621:Seasons
keywords: Diarrhea; Fever; Seasonal distribution; Symptom surveillance