Antibiotics are used to prevent or treat bacterial infections; however, the emergence of antimicrobial resistance is one of the major problems in human and veterinary medicine. Little is known about the prevalence of bacterial antimicrobial resistant associated with wild animals. Moreover, birds are susceptible to several bacterial pathogens common to man. In this sense, Pseudomonas aeruginosa has great relevance, causing infections when the host's defense mechanisms are reduced. The objective of this study was to report a case of isolation of a multidrug-resistant strain of P. aeruginosa in an exposed radio-ulna fracture in a Canindé macaw. The P. aeruginosa strain was identified based on its morphological, tinctorial and biochemical characteristics. To determine antimicrobial susceptibility, the Kirby & Bauer method and the minimum inhibitory concentration (MIC) method were used. According to the results of the antimicrobial sensitivity tests, resistance of the isolated strain was verified in the following antimicrobials groups of the aminoglycoside, β-lactam groups, cephalosporins, sulfonamide and fluorquinolone. In addition to becoming a problem for the conservation of wild animal populations, antimicrobial resistance can have public health implications.

RESUMOO objetivo deste estudo foi avaliar a resistência frente à colistina em isolados de hemoculturas de recém-nascidos (RN) admitidos em um Hospital Escola no período de 4 anos. The objective of this study was to evaluate resistance against colistin in isolates of blood cultures from newborns (NB) admitted in a School Hospital in a 4-year period. The identification tests and antimicrobial susceptibility profiles were performed using automated systems. At the period of this study, 923 blood cultures were positive, 92.09% (850/923) were caused by Gram-positive microorganisms and 7.91% (73/923) by Gram-negative. Of these, two isolates were resistant to colistin: Acinetobacter baumannii and Sphingomonas paucimobilis; and a Pseudomonas aeruginosa isolate showed an intermediate profile to this antimicrobial, also presenting resistance to carbapenems. This profile is worrying since these antimicrobials are the last alternative for the treatment of infections caused by multiresistant Gram-negative bacilli. The results of this study indicate the follow-up of the monitoring of this resistance.Descriptors: Sepsis. Newborn. Colistin.