在过去几年中，纽约市在检查和保护其饮用水供应质量方面采取了许多重要步骤。隐孢子虫和蓝氏贾第虫是供水的特殊微生物。虽然目前没有证据表明纽约市的患病率或水传播风险增加，但该市已实施了几项与监测生物体和相关疾病有关的新项目。已经制定了一些项目，以收集供应水源水中这些微生物的浓度和潜在来源的数据。此外，纽约市已开始努力研究疾病发病率和潜在风险因素，并开始研究饮用水消费与该市水传播疾病之间是否存在任何联系的问题。本演示介绍了该市疾病评估工作的第一个实施要素: 贾第虫病和隐孢子虫病的积极疾病监测。

During the past several years, New York City has taken a number of significant steps towards examining and protecting the quality of its drinking water supply. As the NYC supply is a surface water supply, the microorganisms Giardia lamblia and Cryptosporidium sp. are of particular interest. While there is currently no evidence of an increased illness rate nor increased waterborne risk in New York City, the city has undertaken several new programs related to monitoring the organisms and the related diseases. Programs have been developed to gather data on concentrations and potential sources of these microorganisms in the supply source waters. As well, New York City has initiated efforts to study disease incidence and potential risk factors, and to begin to examine the question of whether there is any link between drinking water consumption and waterborne disease in the City. This presentation addresses the first implemented element of the City's disease assessment efforts: active disease surveillance of giardiasis and cryptosporidiosis.