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1977年六月初,俄亥俄州的 Dayton附近一所学校,连日来参加游泳活动的初级班,103名学生和带队的教师急性胃肠炎爆发。典型病例持续24小时以内,主要特征,呕吐(86%)、痉挛(70%),但半数以上的人有恶心、腹泻和头痛。家庭有原发病例者多半发生继发性感染。这次急性胃肠炎爆发的调查,曾参加外出活动的六个班级,且证明患病的全部学生和老师,给予调查表格。了解他们外出活动时是否有游泳,发病情况和病的性质。对家庭成员的继发病例,同样发给类似调查表,作为对照组。游泳池水样,用标准方法作大肠菌和链球菌细菌学检测,收集水池中部及底部
In early June 1977, a school near Dayton, Ohio, had been involved for the first time in recent days with swimming activities, with 103 students and faculty led by an acute gastroenteritis outbreak. Typical cases last within 24 hours, the main characteristics of vomiting (86%), cramps (70%), but more than half of the people have nausea, diarrhea and headache. Most families have primary cases of secondary infection. The investigation of the outbreak of acute gastroenteritis was conducted in six classes for outing activities and all the students and teachers who proved to be sick were given a survey form. Find out if they are swimming, sick, or ill during their outing. Secondary cases of family members, also issued a similar questionnaire, as a control group. Pool water samples, using standard methods for coliform bacteria and Streptococcus bacteriology testing, collecting the central pool and the bottom