[1] MICRO MEDIA SYST, RES LAB, SAN JOSE, CA 95112 USA
[2] KAISER FDN REG LAB, DEPT PATHOL, CLACKAMAS, OR 97015 USA
[3] VET ADM WADSWORTH HOSP, RES SERV, LOS ANGELES, CA 90024 USA
[4] UNIV CALIF DAVIS, SACRAMENTO MED CTR, MED CTR, CLIN MICROBIOL LAB, SACRAMENTO, CA 95817 USA
[5] CTR DIS CONTROL, ANTIMICROB INVEST SECT, ATLANTA, GA 30333 USA