[1] MINNESOTA DEPT HLTH, DIV MED LABS, MINNEAPOLIS, MN 55440 USA
[2] HENNEPIN CTY COMMUNITY HLTH DEPT, MINNEAPOLIS, MN USA
[3] NIAID, BETHESDA, MD 20205 USA
[4] ST PAUL DIV HLTH, ST PAUL, MN USA
[5] CTR DIS CONTROL, EPIDEMIOL PROGRAM OFF, DIV FIELD SERV, ATLANTA, GA 30333 USA