title: [Risk factors analysis of epidemic hepatitis A in a factory in Shanghai].
abstract: An investigation of the epidemic of hepatitis A which occurred in early 1988 in Shanghai was conducted at the Shanghai Number 2 Yarn Dyeing and Weaving Mill. In this factory the attack rate between January and April 1988 was 9%. The rate was highest among staff and workers who ate raw clams (18%) but also higher among those who ate cooked clams (7%) than among those who did not eat clams (2%). In addition, independent risk factors for infection were: age below 30 years (relative risk = 3.0, 95% confidence interval: 2.0, 4.5) shift work (relative risk = 3.3, 95% confidence interval: 1.9, 5.8) and eating out (relative risk = 4.7, 95% confidence interval: 2.3, 9.7). The consumption of clams contaminated with hepatitis A virus was the main risk factor in this episode. The study indicates that strengthening surveillance of shellfish hygiene is important to prevent future epidemics of hepatitis A.
authors.affiliation: Division of Gastroenterology, Zhongshan Hospital, Shanghai Medical University.
authors.forename: J Y
authors.initials: JY
authors.lastname: Wang
mesh_terms: D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D005506:Food Contamination; D006506:Hepatitis A / Q000453:epidemiology*; D006801:Humans; D015994:Incidence; D012307:Risk Factors; D012758:Shellfish