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Abstract

Otitis externa is a canine disease of multifactorial etiology in which bacteria plays a significant role. Due to the predominant bacterial etiology otitis is usually treated with antibiotics. However, non-prudent use of antibiotics promotes the emergence of antibiotic-resistant bacteria thus compromising the therapy effectiveness. Currently, the increase of antimicrobial resistance (AMR) is one of the biggest threats to global health. For this reason, the aim of the study was to investigate prevalence of the microbiological causes of canine otitis externa and the antibiotic susceptibility of the isolated bacterial strains. The research and sampling were conducted at Veterinary Clinics for small pets in Serbia. Samples were sent to laboratory for bacteriological and mycological testing. Additionally, the sensitivity of the isolated bacteria to antibiotics was evaluated using disc diffusion method. Sixty dogs with otitis externa clinical symptoms were included in the study. Out of a total of 53 positive samples for pathogen presence, bacteria were present in 40. The most prevalent bacteria was Staphylococcus pseudintermedius, followed by Pseudomonas aeruginosa and Proteus spp., while Malassezia pachydermatis was the only isolated yeast pathogen occurring in 36 samples. Generally, the lowest resistance against all bacteria showed enrofloxacin. On the contrary, high resistance to penicillin and amoxicillin was a common finding for G+ and G- bacteria. These results indicate the need for laboratory testing in terms of isolation, identification and antibiotic susceptibility testing, not only in the case of otitis externa in dogs, but in all diseases when it is possible, in order to enhance antimicrobial stewardship and consequently to contribute AMR reduction.
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Authors and Affiliations

N. Tesin
1
D. Stojanovic
1
I. Stancic
1
N. Kladar
2 3
Z. Ružić
1
J. Spasojevic
1
D. Tomanic
1
Z. Kovacevic
1

  1. Department of Veterinary Medicine, Faculty of Agriculture, University of Novi Sad, Trg Dositeja Obradovica 8, 21000 Novi Sad, Serbia
  2. Center for Medical and Pharmaceutical Investigations and Quality Control, Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
  3. Department of Pharmacy, Faculty of Medicine, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
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Abstract

Since drug companies are driven by the need to produce profit they are unwilling to make large investments in the development of new drugs if there is no market large enough to justify such investment. For this reason, veterinarians face a major obstacle – the veterinary drug market is not very profitable, which sometimes leads to not having a licensed drug available for treatment in veterinary practice. In this case, the cascade procedure allows veterinarians to, under certain circumstances, prescribe human approved drugs. The aim of our study was to analyze the pattern of human approved drugs prescription for 150 medical records of dogs participating in the survey. The results show that antimicrobial agents were the most commonly prescribed drugs for animals (50%) of all human approved drugs, and beta-lactams (38.6%) were the most widely used antibiotic classes. The most common general conditions for therapeutic use of antimicrobials in this study were digestive, skin and respiratory disorders. Our study shows that the frequency of bacterial culture, susceptibility testing and cytology was very low. Even though the off-label use of human approved drugs in animal practice is regulated by law, the results of this study indicate the need for more specific strategies and guidelines for such use. This may represent a potential for improvement by raising veterinarians’ awareness toward more prudent use of human drugs.
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Authors and Affiliations

D. Tomanic
1
D. Stojanovic
1
B. Belić
1
I. Davidov
1
N. Novakov
1
M. Radinovic
1
N. Kladar
2
Z. Kovacevic
1

  1. University of Novi Sad, Department of Veterinary Medicine, Faculty of Agriculture, Trg Dositeja Obradovica 8, 21 000 Novi Sad, Serbia
  2. University of Novi Sad, Center for Medical and Pharmaceutical Investigations and Quality Control/Department of Pharmacy, Faculty of Medicine, Hajduk Veljkova 3, 21000 Novi Sad, Serbia

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