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Phenotypic antimicrobial resistance profile of isolates causing clinical mastitis in dairy animals

Carlotta Ceniti, Domenico Britti, Adriano Michele Luigi Santoro, Rosanna Musarella, Lucia Ciambrone, Francesco Casalinuovo, Nicola Costanzo
  • Carlotta Ceniti
    Department of Health Sciences, Magna Græcia University, Catanzaro,
  • Domenico Britti
    Department of Health Sciences, Magna Græcia University, Catanzaro, Italy
  • Adriano Michele Luigi Santoro
    Department of Veterinary Medicine and Animal Production, University of Naples Federico II, Naples, Italy
  • Rosanna Musarella
    Institute for Experimental Veterinary Medicine of Southern Italy, Catanzaro, Italy
  • Lucia Ciambrone
    Institute for Experimental Veterinary Medicine of Southern Italy, Catanzaro, Italy
  • Francesco Casalinuovo
    Institute for Experimental Veterinary Medicine of Southern Italy, Catanzaro, Italy
  • Nicola Costanzo
    Department of Health Sciences, Magna Græcia University, Catanzaro, Italy | costanzo.nic@unicz.it

Abstract

Mastitis is the most frequent and costly disease of lactating animals and is associated with a significant reduction in milk yield, increased cost and culling. Early and specific antibiotic based treatment reduces the severity of the disease. Over the years the extensive use of antimicrobials has led to increase antimicrobial resistance. The present study was designed to investigate the prevalence of microorganisms responsible for mastitis and their antimicrobial resistance pattern. A total of 282 milk samples were collected from different animal species (sheep, cows and goats) with clinical mastitis. Antimicrobial resistance was evaluated for Streptococcus spp. and Staphylococcus spp. In cow samples Streptococcus spp. represented the most frequently isolated genus (33.84%), while Staphylococcus spp. was the most prevalent genus in sheep and goat samples (44.4 and 73.86%, respectively). Gentamicin and chloramphenicol were found to be the most effective drugs against the tested isolates, while the highest resistance rates were observed for amoxicillin, ampicillin, tetracycline, trimethoprim-sulfamethoxazole.

Keywords

Antibiotic resistance; Mastitis; Staphylococcus aureus

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Submitted: 2017-02-02 14:19:44
Published: 2017-05-03 00:00:00
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Copyright (c) 2017 Nicola Costanzo, Carlotta Ceniti, Domenico Britti, Adriano Michele Luigi Santoro, Rosanna Musarella, Lucia Ciambrone, Francesco Casalinuovo

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