[Influence factors of Enterobius vermicularis infection among pupils in Chongqing City]

To investigate Enterobius vermicularis infection among primary school students and its influence factors in Chongqing.Beibei and Changshou were selected as investigated points from October to December 2011. One primary school was randomly chosen from each of the 5 different directions in every investigated point. Adhesive cellophane anal swab was used to examine pinworm eggs for 3 consecutive days. Information on children's family, hygiene habits and school environment was collected by questionnaire.The total infection rate of E. vermicularis was 6.7% (71/1 071). The infection rate in rural schools (7.9%, 60/755) was higher than that of urban schools (3.8%, 12/316) (chi2 = 6.1169, P0.05). The rate in males and females was 6.3% (34/536) and 7.1% (38/535), respectively (chi2 = 0.2463, P0.05). Among the investigated children aged 6-12 years, the infection rate in 6-year-old children (16.03%) was highest. There was a statistical significance among age groups (chi2 = 29.1492, P0.01). With the increase of age, the rate decreased. Multivariate logistic regression analysis showed that location (OR = 0.411), age groups (OR = 0.714), education level of mothers (OR = 0.568), materials of classroom-ground (OR = 0.116) and types of boarding (OR = 0.272) were the influence factors on E. vermicularis infection in primary schools (P0.05).Pinworm control should more focused on rural children, younger group, mothers with lower education, classroom with cement ground and lodging schools in Chongqing City.