[1] Michigan Dept Community Hlth, Lansing, MI 48913 USA
[2] Nebraska Hlth & Human Serv Syst, Lincoln, NE USA
[3] New Mexico Dept Hlth, Santa Fe, NM USA
[4] New Mexico Dept Agr, Las Cruces, NM 88003 USA
[5] Oregon Dept Publ Hlth, Portland, OR USA
[6] Oregon Dept Agr, Salem, OR USA
[7] CDC, Enter Dis Lab Br, Atlanta, GA 30333 USA
[8] CDC, Enter Dis Epidemiol Br, Div Foodborne Bacterial & Mycot Dis, Natl Ctr Zoonot Vector Borne & Enter Dis, Atlanta, GA 30333 USA