[1] AKERSHUS CENT HOSP,DEPT MICROBIOL,NORDBYHAGEN,NORWAY
[2] UNIV OSLO,RIKSHOSP,KAPTEIN W WILHELMSEN FRUES BAKTERIOL INST,OSLO,NORWAY
[3] UNIV ROCHESTER,DEPT BIOL,ROCHESTER,NY 14627
[4] US FDA,OFF BIOL,BETHESDA,MD 20014
[5] WALTER REED ARMY INST RES,WASHINGTON,DC 20307