Detection of Bacteria and Antibiotics Surveillance in Livestock

A special issue of Antibiotics (ISSN 2079-6382). This special issue belongs to the section "Antibiotics in Animal Health".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 1000

Special Issue Editor


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Guest Editor
Department of Poultry Diseases with Clinic, Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia
Interests: bacterial zoonoses; poultry diseases; antibiotic resistance; exotic animals

Special Issue Information

Dear Colleagues,

Because the borders between countries are wide open and there is a free movement of goods, people and animals, the spread of infectious diseases is significantly facilitated. Viral and bacterial infectious diseases represent one of the main causes of death worldwide, in both human and veterinary medicine. However, it is also necessary to mention their negative impact on productivity and the economy. Therefore, it is necessary to detect pathogenic bacteria in different livestock by employing the most suitable methods, in regard to the sample type, the timescale of obtaining results, and costs. Antimicrobial resistance (AMR) is closely related to the pathogenic bacteria present in livestock.  It is therefore necessary to monitor data on the incidence of AMR throughout the entire food chain, from farm to table, using methods that enable an easier comparison between results and their further analysis.

Dr. Danijela Horvatek Tomić
Guest Editor

Manuscript Submission Information

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Keywords

  • livestock
  • bacteria
  • pathogens
  • antibiotic resistance
  • antibiotic surveillance
  • zoonoses

Published Papers (1 paper)

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Research

14 pages, 289 KiB  
Article
Occurrence of Antimicrobial-Resistant Enterococcus spp. in Healthy Chickens Never Exposed to Antimicrobial Agents in Central Italy
by Giulia Cagnoli, Alessia Di Paolo, Fabrizio Bertelloni, Sonia Salvucci, Arianna Buccioni, Margherita Marzoni Fecia di Cossato and Valentina Virginia Ebani
Antibiotics 2024, 13(5), 417; https://doi.org/10.3390/antibiotics13050417 - 1 May 2024
Viewed by 729
Abstract
Enterococci are part of the natural flora of the gastrointestinal tract of mammals, including humans, birds and invertebrates. They can cause infection, mainly among hospitalized patients, as well as acquire and transfer antimicrobial resistance genes. The present study allowed the isolation of 98 [...] Read more.
Enterococci are part of the natural flora of the gastrointestinal tract of mammals, including humans, birds and invertebrates. They can cause infection, mainly among hospitalized patients, as well as acquire and transfer antimicrobial resistance genes. The present study allowed the isolation of 98 Enterococcus (73.47% E. faecium, 23.47% E. faecalis, 3.06% E. avium) strains from 120-day-old healthy chickens that had never been treated with antimicrobials. Their antimicrobial resistance was evaluated by the agar disk diffusion method; high-level aminoglycoside (streptomycin and gentamicin) and vancomycin resistance were established using the microbroth dilution method. The highest percentages of resistant isolates were detected with quinupristin–dalfopristin (88.78%), rifampicin (64.29%), tetracyclines (45.92%), and enrofloxacin (41.84%). High percentages of susceptible strains were found with teicoplanin (100%), amoxicillin–clavulanic acid (97.96%), nitrofurantoin (94.90%), ampicillin (92.86%), chloramphenicol (90.82%), and linezolid (88.78%). About 60% of the strains were classified as MDR (multidrug-resistant). Moreover, PCR was carried out to investigate genes encoding for tetracyclines resistance determinants: tet(M), tet(L), tet(O), tet(K), and Int-Tn. Genes were detected in 68 (69.38%) strains: 36 were shown to be resistant with the agar disk diffusion method, while 28 were intermediate, and 2 were susceptible. The present study showed that chickens never treated with antimicrobials potentially harbor enterococci having phenotypic and genotypic characters of antimicrobial resistance. Full article
(This article belongs to the Special Issue Detection of Bacteria and Antibiotics Surveillance in Livestock)
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