Colistin Induces S. aureus Susceptibility to Bacitracin

Staphylococcus aureus: methicillin-susceptible S. aureus to methicillin-resistant S. aureus and vancomycin-resistant S. aureus.

The evolution of methicillin-resistant and vancomycin-resistant Staphylococcus aureus has demanded serious review of antimicrobial use and development of new agents and revised approaches to prevent and overcome drug resistance. Depending on local conditions and patient risk factors, empirical therapy of suspected S. aureus infection may require coverage of drug-resistant organisms with newer a...

Colistin Susceptibility Testing Using the MicroScan® Colistin Well

Colistin susceptibility testing: time for a review.

respectively, relative to the S. maltophilia strain IAM 1566 protein) (Figure 1). S. maltophilia is a Gram-negative bacterium found in a variety of environments, including soil, water and plants, and is therefore a potential reservoir of the MBL gene. Similar to POM-1 and L1 MBLs, the ability of the PAM-1 enzyme to hydrolyse carbapenems might be relatively low; consequently, the PAM-1-positive ...

Variations in bacitracin susceptibility observed in Staphylococcus and Micrococcus species.

Bacitracin susceptibility was evaluated as a laboratory method to differentiate staphylococci from micrococci. A total of 317 staphylococcal isolates and 108 micrococcal isolates were each tested for susceptibility to bacitracin by a disk-diffusion method using disks of three different potencies (0.04, 2.0, and 10.0 U) and a broth dilution method to obtain MICs. When a growth inhibition zone di...

Microbial Susceptibility and Plasmid Profiles of Methicillin-Resistant Staphylococcus aureus and Methicillin-Susceptible S. aureus

BACKGROUND Today, significant increase in the prevalence and emergence of methicillin-resistant Staphylococcus aureus (MRSA) is a serious public health concern and is likely to have a dramatic negative impact on many current medical practices. Therefore, identification of MRSA strains is important for both clinical and epidemiological implications. OBJECTIVES The present study was carried out...