[1] INST PASTEUR,UNITE ANAEROBIES,28 RUE DR ROUX,F-75724 PARIS 15,FRANCE
[2] NW & ALASKA FISHERIES CTR,SEATTLE,WA 98112
[3] BUNDESFORSCHUNGSSANSTALT VIRUSKRANKHEITEN TIERE,INST MIKROBIOL,W-7400 TUBINGEN,GERMANY
[4] INST PASTEUR,UNITE ANTIGENES BACTERIENS,F-75724 PARIS 15,FRANCE
[5] TUFTS UNIV,SCH MED,DEPT MOLEC BIOL & MICROBIOL,BOSTON,MA 02111