Concord is the most common serotype of the human isolates reported to be resistant to third generation cephalosporins [ 11], and S. Kentucky is the most frequently reported ciprofloxacin resistant serotype of animal origin [ 12, 13].
If no standardized definition for MDR has been given within the scientific community, the definition most frequently used is "resistant to three or more antimicrobial classes" (Magiorakos et al. 2012).
In this study, we established and optimized a novel loop-mediated isothermal amplification (LAMP) assay for the detection of Pseudomonas fluorescens in raw cow milk, as the most frequently reported heat-resistant lipase-producing bacterial species.
The most frequently encountered LAM-resistant mutant is rtM204V/I, which possesses a mutation located at the catalytic YMDD motif [ 8- 11].
Importantly, the most frequently encountered isoniazid-resistant clinical isolates remain fully susceptible to pyridomycin, thus opening new avenues for drug development.
However, most interestingly, no cross resistance was observed between pyridomycin and isoniazid, both in laboratory strains containing mutations in InhA or in the most frequently encountered isoniazid-resistant clinical isolates that contain mutations in katG (a gene required to activate isoniazid).
There is therefore a need for research to discover and develop agents with activity against a range of both Gram-positive and Gram-negative pathogens, and against atypical pathogens, particularly those most frequently associated with institutional, resistant, or complicated infections.
MRSA is frequently resistant to most of the commonly used antimicrobial agents including the aminoglycosides, macrolides, chloramphenicol, tetracycline and fluoroquinolones [ 16].
We found that the S531L mutation in the rpoB gene occurred most frequently (50%) among rifampicin resistant strains.
The most frequently isolated microorganisms were methicillin resistant Staphylococcus aureus (30.4%), Pseudomonas aeruginosa (21.4%), Acinetobacter spp. (12.5%) and Klebsiella pneumoniae (10.7%).
