Effect of Physical Properties on Growth and Survival of Staphylococcus

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Amel Ismail Abdel Samed, Samed
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This study was carried out on 13 isolates of Staphylococcus species, viz: Staph. aureus, Staph. caseolyticus, Staph. sciuri, Staph. epidermidis, Staph. chromogenes, Staph. simulans, Staph. simians, Staph. lugdunensis, Staph. capitis, Staph. hyicus coagulase-negative, Staph. capitis subsp ureolyticus, Staph. hominis, Staph. saccharolyticus and Staph. warneri. The ability of differential and selective media in supporting Staphylococcus species growth was studied. It was found that the selective media studied were inhibitory for some species when incubated for 24 hours at 37°C, while incubation of 48 hrs allowed some species to grow where they failed to do so at 24 hour such as Staph. saccharolyticus, Staph. capitis, Staph. simians and Staph. lugdunensis. Oxidase-positive species such as Staph. sciuri and Staph. caseolyticus which possess a heatstable cytochrome C enzyme system were found to be more resistant to heat. Staphylococci could grow at pH 10 and were found to be more resistant to sodium chloride. Survival time increased at low temperatures and low concentration of sodium chloride. Staph. epidermidis, Staph. simians, Staph. saccharolyticus, Staph. hyicus, Staph. warneri, Staph. capitis-subspp- ureolyticus and Staph. hominis showed similar behaviour in their weak or failure to survive or grow at 50 to 60°C and at various concentrations of sodium chloride
of Physical Properties on Growth and Survival of Staphylococcus