[1] PHS, CTR DIS CONTROL,VIRAL DIS BRANCH, RABIES CONTROL UNIT,EPIDEMIOL PROGRAM,POB 363, LAWRENCEVILLE, GA 30245 USA
[2] TEXAS STATE DEPT HLTH, AUSTIN, TX 78700 USA
[3] SCOTT & WHITE CLIN & HOSP, DEPT INTERNAL MED, SECT INFECT DIS, TEMPLE, TX 76501 USA
[4] UNIV HOSP CLEVELAND, DEPT MED, DIV NEUROL, CLEVELAND, OH 44106 USA
[5] CASE WESTERN RESERVE UNIV, MED SCH, CLEVELAND, OH 44106 USA