Keystone J S, Yang J, Grisdale D, Harrington M, Pillon L, Andreychuk R
Can Med Assoc J. 1984 Oct 1;131(7):733-5.
In 1981, 900 children (aged 3 months to 10 years) and 146 staff attending 22 day-care centres in metropolitan Toronto chosen at random provided a stool specimen in a survey for intestinal parasites. Of the children, 4% to 36% were infected in 20 of 22 centres. Overall, 19% of the children and 14% of the staff had intestinal parasites: 8.6% and 4.0% respectively had Dientamoeba fragilis, and 7.8% and 2.0% respectively had Giardia lamblia. The highest prevalence of dientamebiasis was in the 7- to 10-year-olds, whereas giardiasis was detected most frequently in the 6-year-olds. Infection with intestinal parasites was not correlated with age, sex, duration in the day-care centre, dog ownership, travel history, gastrointestinal symptoms or the proportion of children in the day-care centre who were born in less developed countries. Immigrant children and children of parents born in industrialized countries (including Canada) were more likely to be infected than were children born in Canada of parents from the developing world. Dientamebiasis was associated with cat ownership. Thus, intestinal protozoa--in particular, D. fragilis and G. lamblia--are endemic in Toronto day-care centres.
1981年，在多伦多市随机选取的22家日托中心的900名儿童（年龄3个月至10岁）和146名工作人员，在一项肠道寄生虫调查中提供了粪便样本。在22家中心中的20家，4%至36%的儿童受到感染。总体而言，19%的儿童和14%的工作人员有肠道寄生虫：分别有8.6%和4.0%感染脆弱双核阿米巴，7.8%和2.0%感染蓝氏贾第鞭毛虫。双核阿米巴病患病率最高的是7至10岁儿童，而贾第虫病在6岁儿童中检出率最高。肠道寄生虫感染与年龄、性别、在日托中心的时长、是否养狗、旅行史、胃肠道症状或日托中心中出生在欠发达国家的儿童比例无关。移民儿童以及父母出生在工业化国家（包括加拿大）的儿童比父母来自发展中国家的加拿大本土儿童更易感染。双核阿米巴病与养猫有关。因此，肠道原生动物——尤其是脆弱双核阿米巴和蓝氏贾第鞭毛虫——在多伦多的日托中心呈地方性流行。
