Mathias R G, Riben P D, Osei W D
Dept. of Health Care & Epidemiology, University of British Columbia, Vancouver.
Can J Public Health. 1992 Sep-Oct;83(5):382-4.
Waterborne outbreaks of giardiasis have been documented in many areas of North America associated with contaminated surface water supplies. The Greater Vancouver Water District (GVWD) administers the distribution of surface waters to 1.4 million people. We wished to determine if endemic giardiasis was associated with this water supply. One hundred and eighty cases, an equal number of laboratory (enteric) controls and 94 neighbourhood (friend) controls were interviewed by questionnaire. The cases and controls were similar in age, sex and community of residence. Risk factors for giardiasis included having a child under six in the house and travel, both in B.C. but outside of the GVWD, and in Africa, the Americas, south of the U.S. or Asia. The cases drank 3.6 cups of water per day, the enteric controls 3.5 and the friend controls 3.7. These amounts are similar to those reported ingested in outbreak studies. Water consumption was not a risk for endemic giardiasis.
北美许多地区都记录了水源性贾第虫病暴发事件，这些事件与受污染的地表水供应有关。大温哥华水区（GVWD）负责向140万人供应地表水。我们希望确定地方性贾第虫病是否与这种供水有关。通过问卷调查对180例病例、数量相等的实验室（肠道）对照和94名邻里（朋友）对照进行了访谈。病例和对照在年龄、性别和居住社区方面相似。贾第虫病的风险因素包括家中有6岁以下儿童以及旅行，旅行地点包括不列颠哥伦比亚省但不在GVWD范围内，以及非洲、美洲、美国南部或亚洲。病例每天饮用3.6杯水，肠道对照为3.5杯，朋友对照为3.7杯。这些饮水量与暴发研究中报告的摄入量相似。饮水并非地方性贾第虫病的风险因素。
