[1] CDC, Div Foodborne Waterborne & Environm Dis, Natl Ctr Emerging & Zoonot Infect Dis, Atlanta, GA 30333 USA
[2] Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA
[3] Calif Dept Publ Hlth, Sacramento, CA USA
[4] US FDA, College Pk, MD USA
[5] Placer Cty Hlth & Human Serv, Auburn, CA USA
[6] Eagle Med Serv LLC, San Antonio, TX USA