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Staphylococcus aureus represents a serious health hazard on both animals and humans. The main goal of the present work was to compare between S. aureus isolated from animal and human origin. This was achieved through studying the virulence, phenotypic characterization, genotypic testing of mecA gene, analysis the antibiotic resistance profile of the recovered S. aureus isolates. A total number of 165 samples were collected from clinical mastitic cows and sheep, pus from abscesses collected from septic wounds of infected animals, respectively. Moreover, blood, pus swabs from abscesses and septic wounds, and sputum samples were collected from diseased humans from Assiut Governorate, Egypt. The results revealed that incidence of S. aureus isolates recovered from the examined animal samples were 8.33%, 100% and 20%, per, while from human cases (blood, pus and sputum) were 16.67%, 53.49% and 75%, independently. Using Staphaurex kits, the prevalence of coagulase positive S. aureus from animal samples reached 8.33%, 100% and 20%, but from the diseased human cases were 16.67%, 53.49% and 75%, respectively. Antimicrobial Sensitivity Testing of the animal isolates were resistant to cefoxitin (15.79%), tetracycline (10.53%), clindamycin and erythromycin (10.53%), while the isolates were sensitive to gentamicin (100%), trimethoprim + sulfamethoxazole and vancomycin (94.74% for each). However, S. aureus human isolates were resistant to cefoxitin (75%) and tetracycline (78.57%) and sensitive to vancomycin (100%), ciprofloxacin (89.29%) and trimethoprim+ sulfamethoxazole (82.14%). Out of 47 identified S. aureus strains, 3 from animal isolates (15.79%) and 21 from human isolates (75%) proved to be methicillin-resistant (MRSA). Furthermore, one animal isolate (5.26%) and 12 human isolates (42.86%) were multi-drug resistant (MDR). S. aureus isolates from animal and humans were subjected to genotypic characterization of mecA gene using PCR. All the animal and human isolates were positive for mecA gene with a percentage of 100%. The results of this study provide that from both animals and human samples; the isolation rate of S. aureus was greater than that of MRSA followed by MDR.

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Many Mycoplasma species are involved in caprine and ovine pneumonia all over the world causing serious economic losses. These species have been reported to cause pneumonia, mastitis, arthritis, conjunctivitis and genital infection. The objective of the present study was to detect Mycoplasma species in the respiratory system of sheep and goats. So, a total of 400 samples (250 from sheep and 150 from goat) were examined bacteriologically, biochemically, by PCR, sequencing, in addition to the antibiotic susceptibility profiles screening. Only 13 isolates could be identified as Mycoplasma species. One of these sequences was submitted to the Genbank taking the accession number MK910041; Mycoplasma species 'ovine/caprine serogroup 11'. Only 7 isolates were weak biofilm producers and the other 6 isolates were non biofilm producers; 8 isolates were positive for the catalase test and 5 were negative. H2S production was recorded in 10 isolates; haemolysis was detected in only 6 isolates. In addition, the minimum inhibitory concentrations (MICs) for seven antimicrobial agents, including danofloxacin, tulathromycin, tylosin, streptomycin, lincomycin, florfenicol and oxytetracycline, were determined. All the isolates (100%) were sensitive to tulathromycin and tylosin, streptomycin and oxytetracycline; 38.5% were sensitive to danofloxacin, 69.2% were sensitive to florfenicol, while 69.2% of isolates were resistant to lincomycin. As all the isolates were recovered from apparently healthy and clinically diseased animals and identified as untyped Mycoplasma species, more investigations will be done to identify these isolates and discover their roles in infection.