Detection and antimicrobial susceptibility patterns of Salmonella enterica subsp. arizonae and Proteus spp. associated with gastrointestinal disease in rescued hedgehogs (Erinaceus europaeus).

Western European hedgehogs (Erinaceus europaeus) are frequently admitted to wildlife rehabilitation centres, where infectious diseases may affect recovery and raise One Health concerns. This study aimed to identify bacterial isolates recovered from hedgehog samples submitted for suspected gastrointestinal infection and to characterise their antimicrobial susceptibility profiles. Five bacterial isolates were analysed using the MicroScan WalkAway Plus® system with the Neg-Urine-Combo 98 panel, and the results were interpreted in accordance with EUCAST guidelines. The identified bacteria included one isolate of Salmonella enterica subsp. arizonae, three isolates of Proteus mirabilis and one isolate of Proteus penneri. The Salmonella enterica subsp. arizonae isolate was susceptible to all antimicrobials for which a valid result was obtained. Proteus spp. isolates were susceptible to cefotaxime, nalidixic acid, ciprofloxacin, levofloxacin, norfloxacin, amikacin, gentamicin, tobramycin, aztreonam, cefoxitin, ceftazidime and fosfomycin. However, resistance was observed to amoxicillin-clavulanic acid, ampicillin, ertapenem, meropenem, trimethoprim-sulfamethoxazole, cefuroxime, piperacillin-tazobactam, colistin and nitrofurantoin, with the latter two showing resistance in all Proteus spp. The Proteus penneri isolate displayed the broadest resistance profile, including resistance to several β-lactams, carbapenems. As expected, all Proteus spp. showed intrinsic non-susceptibility to colistin and nitrofurantoin. Although the Salmonella enterica subsp. arizonae isolate was susceptible to the tested agents, Proteus spp. from hedgehog samples may display relevant antimicrobial resistance (AMR) patterns. Therefore, continuous bacteriological monitoring and antimicrobial susceptibility testing are important in wildlife rehabilitation settings to guide treatment decisions and support One Health surveillance.