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PubMed1993

Evaluation of Biolog for identification of members of the family Micrococcaceae.

The Biolog Identification System (Biolog, Inc., Hayward, Calif.) was challenged at two separate laboratories with 113 coded isolates, including 33 type strains of staphylococci, 5 strains of Micrococcus spp., and 1 strain of Stomatococcus mucilaginosus. Test parameters between the sites were controlled as much as possible. Discrepancies were arbitrated by using conventional biochemicals. Overall accuracies (correct to the species level) upon initial testing were 47.7 and 59.3%, respectively, at the two laboratories. After repeat testing of isolates generating "no identification" responses or errors, the overall accuracies increased to 69.0 and 74.3% at the two sites, respectively, revealing no significant difference in the final results at the two laboratories (78 of 113 versus 84 of 113; P > 0.05). Error rates were 7.1% at one site and 9.7% at the other. The Biolog is not yet accurate enough to serve as a primary method for identifying staphylococci.

Bacteriological Techniques↗
PubMed2003

A survey of antibiotic resistance in Micrococcaceae isolated from Italian dry fermented sausages.

The transfer of bacteria that are resistant to antimicrobial agents or resistance genes from animals to humans via the food chain is increasingly a problem. Therefore, it is important to determine the species and the numbers of bacteria involved in this phenomenon. For this purpose, 148 strains of microstaphylococci were isolated from three types of Italian dry fermented sausages. Eight of 148 strains belonged to the genera Kocuria and Micrococcus. The remaining 140 strains belonged to 11 different species of the genus Staphylococcus. The species most frequently isolated was Staphylococcus xylosus, followed by Staphylococcus saprophyticus and Staphylococcus aureus. Antibiotic resistance levels differed among the species and depended on the strain origin. Microstaphylococci were generally susceptible to beta-lactams, but 12 strains were resistant to methicillin, 8 were resistant to oxacillin, and 9 were resistant to penicillin G. No resistance was observed for aminoglicosides and cephalosporines. Many strains were resistant to sulfonamide, colistin suphate, tetracyclin, and bacitracin. Two strains of S. aureus, four strains of S. xylosus, and one strain of Staphylococcus sciuri were able to grow in the presence of 8 microg of vancomycin per g, but all strains were susceptible to teicoplanin. Twenty-two microstaphylococci were resistant to at least five of the tested antibiotics. The multiresistant strain S. aureus 899 was unaffected by eight antibiotics, including vancomycin and methicillin, indicating that a more prudent use of antibiotics in animal husbandry and better hygienic conditions during production should be encouraged because they can play a major role in reducing the incidence of such multiresistant microorganisms and the possible spread of the genetic elements of their resistance.

Animal Husbandry↗
PubMed1978

[Action of egg lysozyme on representatives of the family Micrococcaceae. Its action on Micrococcus].

The results of the study of the effect of various concentrations of egg lysozyme on M. luteus and M. varians using 2 methods, i.e. serial dilutions in agar and turbidimetric are presented. It was found that the MIC of lysozyme for M. luteus ranged within wide limits, from less than 0.0003 to 1 mg/ml. M. varians was stable to lysozyme. The MIC for all the strains was 8 mg/ml. The turbidimetric method provided determination of general regularities in changes of the optical density in all the strains of M. luteus under the effect of various concentrations of lysozyme. On the basis of these data it was possible to consider the method as the most deep means for determining the intraspecies similarities in the surface structures of Micrococcus as compared to the method of serial dilutions in agar. The dynamics of the changes in the optical density of the M. luteus suspension markedly differed from that of M. varians.

Animals↗
PubMed1979

[Action of egg lysozyme on representatives of the family Micrococcaceae. The action on staphylococci].

The results of the study on the effect of various concentrations of lysozyme on staphylococci of three species, i.e. Staphylococcus aureus, Staphylococcus epidermidis and Staphylococcus saprophyticus are presented. The study was performed with the use of the turbidimetric method. It was found that all the staphylococci had a common tendency for changing the optic density (OD) of the suspensions under the effect of lysozyme which was different from that in Micrococcus luteus. However, the dynamics of decreasing the OD in Staph. saprophyticus was characterized by some properties which provided a supposition that the structures of the cell walls in Staph. aureus and Staph. epidermidis were close, while the cell walls in Staph. saprophyticus had some unknown characteristics.

Dose-Response Relationship, Drug↗