An increase in oxacillin activity was observed against methicillin-resistant coagulase-negative staphylococci (MRCNS) and methicillin-resistant Staphylococcus aureus (MRSA) in the presence of a sub-MIC of vancomycin. Vancomycin and oxacillin were synergistic against 14 of 21 strains of MRCNS and MRSA. A pattern of enhanced killing was also supported by time-kill studies. These results suggest t...

Staphylococcus aureus and coagulase-negative staphylococcal isolates from various geographic areas in the United States were examined by using a conjugative transfer gene DNA probe in dot-blot hybridization assays. Of 175 S. aureus isolates, 47 (27%) hybridized with the probe, while 24 of 208 (11.5%) coagulase-negative staphylococci hybridized. However, among methicillin-resistant S. aureus 52%...

There are a number of reports that bacteria which have been made resistant to antibiotics may be rendered normally susceptible by contact with sensitive organisms, with extracts of such organisms, or with culture filtrates. Some of these reports are mutually contradictory in important respects, and the results have not been reproducible regularly by other workers. Voureka (1948) found that when...

The antibiotic susceptibility test was carried out on 103 Staphylococcus aureus and 136 coagulase-negative staphylococci (CNS) strains. Only 35 of the isolates were susceptible to all antibiotics tested, while the remaining 204 isolates were resistant at least to one of the antibiotics. Among staphylococci, 18 isolates of S. aureus and 31 isolates of CNS were found phenotypically resistant to m...

Cloxacillin-resistant strains of Staphylococcus aureus were detected by their ability to grow on agar containing 1.6 mug./ml. of cloxacillin, a more reliable method than the disc-diffusion test. At Sefton General Hospital, Liverpool, between 1963 and 1965, there was an increase in the number of infections among in-patients that were caused by staphylococci resistant to cloxacillin despite the f...

Background and objective: The treatment of bacterial infections especially of the family Staphylococcaceae is a significant health burden that has led to economic losses, and high morbidity and mortality rates globally. This study aimed at the isolation and characterization of coagulase-positive, methicillin, and multi-drug-resistant Staphylococci isolated from wounds of patients. Methods: Fo...

Objectives: Staphylococci were most prominent factors that responsible for skin, soft tissue and foreign body infections. Gaining resistance to methicillin and various antibiotics in these microorganisms over the years increased morbidity and mortality, especially in hospitalized patients. In such situations number of preferred antibiotics was limited. The aim of this study was to investigate i...

Objective Coagulase-negative staphylococci are among the most frequently isolated microorganisms in blood cultures. The aim of this study was to assess [1] the clinical characteristics of methicillin-resistant, coagulase-negative staphylococci bacteremia and [2] the susceptibility of the isolated bacteria to glycopeptides. Methods We retrospectively reviewed the medical records of 70 patients f...

Staphylococci isolated from 98 mastitic cow’s milk samples were analyzed for the production of alpha,beta and delta-hemolysin on sheep, bovine and horse red blood cells and in vitro susceptibility to several antimicrobial agents. Out of a total of 18 isolated strains, 100% demonstrated hemolytic activity either alone or in combined forms. Among 8 isolates of S. aureus 3 isolates produced α/β an...

The presence, distribution and antibiotic profile of staphylococci was determined in River Ganga in Uttarakhand region (India). A total of 128 staphylococcal strains were obtained from 32 sites which corresponded to three species namely S. aureus, S. hominis and S. aegilis. S. aureus dominated the staphylococcal population comprising of 68.75% of the total staphylococci. The sensitivity of stap...