Relevance to social and economic so development of Hong Kong Numerous food poisonings epidemic disease outbreaks >3, 600 hepatitis A, mostly due to consumption of oysters Beach closure, 50% higher chance of contracting infection• Numerous food poisonings & epidemic disease outbreaks • >3,600 hepatitis A, mostly due to consumption of oysters • Beach closure, 50% higher chance of contracting infection Relevance to social and economic development of Hong Kong