作者单位:WDS Inc, Atlanta, GA 30309 USA[1]Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA[2]Ctr Dis Control & Prevent, Div Foodborne Waterborne & Environm Dis, Atlanta, GA USA[3]Osaka Univ, Japan Thailand Res Collaborat Ctr Emerging & Re E, Microbial Dis Res Inst, Suita, Osaka[4]