[1] CTR DIS CONTROL, CTR INFECT DIS, DIV BACTERIAL DIS, STAT SERV ACTIV, ATLANTA, GA 30333 USA
[2] CTR DIS CONTROL, EPIDEMIOL PROGRAM OFF, DIV FIELD SERV, ATLANTA, GA 30333 USA
[3] OREGON STATE HLTH DIV, DEPT HUMAN RESOURCES, PORTLAND, OR USA
[4] MICHIGAN DEPT PUBL HLTH, LAB & EPIDEMIOL ADM, LANSING, MI 48909 USA
[5] JACKSON CTY HLTH DEPT, MEDFORD, OR USA
[6] TRI CTY HLTH DEPT, TRAVERSE CITY, MI USA