[1] CTR DIS CONTROL & PREVENT,NATL IMMUNIZAT PROGRAM,ATLANTA,GA 30333
[2] UNIV WASHINGTON,SCH MED,DEPT LAB MED,SEATTLE,WA 98195
[3] UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195
[4] UNIV WASHINGTON,SCH MED,DEPT MICROBIOL,SEATTLE,WA 98195
[5] UNIV ALABAMA,DEPT MICROBIOL,BIRMINGHAM,AL 35294
[6] UNIV ALABAMA,DEPT PEDIAT,BIRMINGHAM,AL 35294
[7] UNIV ALABAMA,DEPT MED,BIRMINGHAM,AL 35294