title: [Investigation on prevalence of soil-transmitted nematode infections and influencing factors for children in southwest areas of China].
abstract: OBJECTIVE
  To understand the infection status and main risk factors of soil-transmitted nematodes in southwest China so as to provide the evidence for making the control programs for soil-transmitted nematodiasis.
  
  
  METHODS
  The prevalence of soil-transmitted nematode infections was determined by Kato-Katz technique and influencing factors were surveyed by using a standardized questionnaire, and in part of the children, the examination of Enterobius vermicularis eggs was performed by using the cellophane swab method. The relationship between soil-transmitted nematode infections and influencing factors was analyzed by the multiple probit estimated method.
  
  
  RESULTS
  A total of 1 707 children were examined, with a soil-transmitted nematode infection rate of 22.2%, the crowd infection rates ofAscaris lumbricoides, hookworm, and Trichuris trichiura were 16.0%, 3.8% and 6.6% respectively and 495 children were examined on Enterobius vermicularis eggs, with the infection rate of 5.1%. The results of probit estimated analysis suggested that the effects of 4 factors on soil-transmitted nematode infections were significant (all P values were less than 0.05), namely the number of sib, educational level of mother, drinking unboiled water and raising livestock and poultry. Among the factors above, the educational level of mother could reduce the probability of infection (ME = -0.074), while the number of sib, drinking unboiled water and raising livestock and poultry could increase the probability of the infections (with ME of 0.028, -0.112 and 0.080, respectively).
  
  
  CONCLUSIONS
  Soil-transmitted nematode infection rates are still in a high level for children in southwest poor areas of China, with Ascaris lumbricoides as a priority. The changes of children's bad health habits, raising livestock and poultry habits, and implementing the health education about parasitic diseases in mothers would be of great significance for the prevention and control of soil-transmitted nematodiasis.
authors.affiliation: Center for Chinese Agricultural Policy, Chinese Academy of Science, Beijing 100101, China.
authors.forename: Xiao-Bing
authors.initials: XB
authors.lastname: Wang
authors.forename: Guo-Fei
authors.initials: GF
authors.lastname: Wang
authors.forename: Lin-Xiu
authors.initials: LX
authors.lastname: Zhang
authors.forename: Ren-Fu
authors.initials: RF
authors.lastname: Luo
authors.forename: Hong-Chun
authors.initials: HC
authors.lastname: Tian
authors.forename: Li-Na
authors.initials: LN
authors.lastname: Tang
authors.forename: Ju-Jun
authors.initials: JJ
authors.lastname: Wang
authors.forename: Alexis
authors.initials: A
authors.lastname: Medina
authors.forename: Paul
authors.initials: P
authors.lastname: Wise
authors.forename: Scott
authors.initials: S
authors.lastname: Rozelle
mesh_terms: D000818:Animals; D017164:Ascaris lumbricoides / Q000302:isolation & purification; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D006801:Humans; D009349:Nematode Infections / Q000453:epidemiology* / Q000635:transmission*; D010272:Parasitic Diseases / Q000453:epidemiology / Q000469:parasitology / Q000635:transmission; D015995:Prevalence; D012307:Risk Factors; D012987:Soil / Q000469:parasitology*
chemical_list: D012987:Soil