Marked Presence of Methicillin-Resistant Staphylococcus aureus in Wild Lagomorphs in Valencia, Spain.

Simple Summary The presence of bacteria resistant to antibiotics, such asStaphylococcus aureusresistant to methicillin (MRSA), is becoming an increasing everyday concern for their implications for human and animal health. This is even more alarming when such bacteria are isolated in wild animals which, in principle, should not come into contact with antibiotics. This work studied 353 rabbits and 10 hares hunted in rabbit high-density areas. Of these, 41.3% carriedS. aureusin some sampled locations, of which 63.3% were MRSA. These are surprising results given the unexpected high presence of MRSA in the studied animals. This finding is very worrying because these animals tend to enter the food chain with no veterinary control, which implies a risk for human health. Thus it is necessary to extend this study to other, less-populated areas with other animal species (ruminants, rabbit predators, hunting dogs, etc.) or even water sources to obtain further knowledge about the origin of bacterial resistances in nature. The appearance of methicillin-resistant strains ofStaphylococcus aureus(MRSA) in several animal species (including rabbits) has set off alarms for their capacity to act as reservoirs for this bacterium. This is especially important in wild animals given its epidemiological implications. The objectives of this study were to identify and characterizeS. aureus, specifically MRSA, strains in wild lagomorph high-density areas. Ten hares and 353 wild rabbits from 14 towns with a high rabbit density in the Valencian region (eastern Spanish coast) were sampled. Swabs from the nasal cavity, ears, perineum and lesions (when present) were taken for microbiological studies. The detection of different genes and antibiotic susceptibility studies were also carried out. Of all the animals, 41.3% were positive forS. aureus, of which 63.3% were MRSA. Ears were the anatomical location with moreS. aureusand MRSA strains. The more frequently identified MLST type was ST1945 (97.1%, 136/140). ThemecA gene was found only in one sample. The rest (n= 139) carried themecC gene and were included in CC130, except one. Penicillin resistance was detected in 28mec-negative isolates and, in one case, bacitracin resistance.mecA isolate presented resistance to enrofloxacin and tetracycline, and 10mecC isolates also showed bacitracin resistance. No MRSA isolate was positive for geneschp,sea,tstand PVL. Two ST1945 isolates contained IEC type E (comprising genesscnandsak).mecA-isolate was positive forblaZ. Of the 28 MSSA strains showing resistance to penicillin, 22 carried theblaZ gene. These surprising results highlight the marked presence of MRSA strains in wild rabbits in high-density areas.