This species can grow at temperatures between 1 35 �C, with the optimal growth temperature being 30 �C . At this temperature, the bacteria has a doubling time of four hours when grown in tryptic soy broth without glucose . " H . glaciei " is resistant to a number of antibiotics : ampicillin, bacitracin, chloramphenicol, ciprofloxacin, penicillin, nalidixic acid, rifampicin, streptomycin and vancomycin.