[1] MONTANA STATE DEPT HLTH & ENVIRONM SERV,HELENA,MT
[2] WYOMING DEPT HLTH,CHEYENNE,WY
[3] IDAHO DEPT HLTH & WELF,BOISE,ID
[4] WHO,DIV COMMUNICABLE DIS,CTR INFLUENZA,CH-1211 GENEVA 27,SWITZERLAND
[5] CENT PUBL HLTH LAB,PUBL HLTH LAB SERV,COMMUNICABLE DIS SURVEILLANCE CTR,LONDON NW9 5HT,ENGLAND
[6] CENT PUBL HLTH LAB,DIV VIRUS REFERENCE,LONDON NW9 5HT,ENGLAND
[7] NATL PUBL HLTH INST,SF-00280 HELSINKI 28,FINLAND
[8] SWEDISH INST INFECT DIS CONTROL,STOCKHOLM,SWEDEN
[9] CTR DIS CONTROL,NATL CTR INFECT DIS,ATLANTA,GA 30333
[10] CTR DIS CONTROL,NATL CTR INFECT DIS,DIV VIRAL & RICKETTSIAL DIS,OFF DIRECTOR,ATLANTA,GA 30333