OBJECTIVES: To characterize the genetic basis of azithromycin resistance in Escherichia coli and Salmonella collected within the EU harmonized antimicrobial resistance (AMR) surveillance programme in 2014-18 and the Danish AMR surveillance programme in 2016-19. METHODS: WGS data of 1007 E. coli [165 azithromycin resistant (MIC > 16 mg/L)] and 269 Salmonella [29 azithromycin resistant (MIC > 16 mg/L)] were screened for acquired macrolide resistance genes and mutations in rplDV, 23S rRNA and acrB genes using ResFinder v4.0, AMRFinder Plus and custom scripts. Genotype-phenotype concordance was determined for all isolates. Transferability of mef(C)-mph(G)-carrying plasmids was assessed by conjugation experiments. RESULTS: mph(A), mph(B), mef(B), erm(B) and mef(C)-mph(G) were detected in E. coli and Salmonella, whereas erm(C), erm(42), ere(A) and mph(E)-msr(E) were detected in E. coli only. The presence of macrolide resistance genes, alone or in combination, was concordant with the azithromycin-resistant phenotype in 69% of isolates. Distinct mph(A) operon structures were observed in azithromycin-susceptible (n = 50) and -resistant (n = 136) isolates. mef(C)-mph(G) were detected in porcine and bovine E. coli and in porcine Salmonella enterica serovar Derby and Salmonella enterica 1,4, [5],12:i:-, flanked downstream by ISCR2 or TnAs1 and associated with IncIγ and IncFII plasmids. CONCLUSIONS: Diverse azithromycin resistance genes were detected in E. coli and Salmonella from food-producing animals and meat in Europe. Azithromycin resistance genes mef(C)-mph(G) and erm(42) appear to be emerging primarily in porcine E. coli isolates. The identification of distinct mph(A) operon structures in susceptible and resistant isolates increases the predictive power of WGS-based methods for in silico detection of azithromycin resistance in Enterobacterales.

• MeSH
• antibakteriální látky * farmakologie   MeSH
• azithromycin * farmakologie   MeSH
• bakteriální geny MeSH
• bakteriální léková rezistence * genetika   MeSH
• epidemiologické monitorování MeSH
• Escherichia coli * účinky léků   genetika   MeSH
• genotyp MeSH
• infekce vyvolané Escherichia coli mikrobiologie   MeSH
• makrolidy farmakologie   MeSH
• maso * mikrobiologie   MeSH
• mikrobiální testy citlivosti * MeSH
• plazmidy genetika   MeSH
• prasata MeSH
• Salmonella * účinky léků   genetika   izolace a purifikace   MeSH
• sekvenování celého genomu MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Geografické názvy
• Evropa MeSH

• Publikační typ
• abstrakt z konference MeSH

INTRODUCTION AND OBJECTIVE: Neospora caninum and Toxoplasma gondii are worldwide spread parasites, causing serious illnesses in sensitive animals; toxoplasmosis is also important zoonosis. Although neosporosis is not considered as a zoonosis, it leads to aborted births in cattle, as well as paresis and paralysis in dogs. OBJECTIVE: The aim of this study was to discover the prevalence of N. caninum and T. gondii antibodies in red foxes (Vulpes vulpes) in the Czech Republic. MATERIALS AND METHOD: Sera of 80 foxes from 8 regions of the Czech Republic were tested for antibodies to N. caninum and T. gondii by competitive enzyme linked immunosorbent assay (cELISA) and indirect ELISA. All samples were simultaneously tested by indirect fluorescent antibody test (IFAT) to detect both N. caninum and T. gondii antibodies. RESULTS: Antibodies to N. caninum were found by IFAT in 3 (3.8%) red foxes with titre 50 and in 2 (2.5%) red foxes with inhibition 42.7% and 30.2 %. Antibodies to T. gondii were found in all tested animals in both IFAT (titres 50-6400) and in ELISA (S/P ranging from 34%-133%). CONCLUSION: This is the first prevalence study of N. caninum and T. gondii antibodies in red foxes in the Czech Republic. The results obtained show that red foxes are exposed at different levels to both protozoan infections, and thus could play an important role in the transmission cycle of N. caninum and T. gondii in sylvatic cycle.

• MeSH
• ELISA veterinární   MeSH
• fluorescenční protilátková technika nepřímá veterinární   MeSH
• kokcidióza epidemiologie   parazitologie   veterinární   MeSH
• lišky * MeSH
• Neospora izolace a purifikace   MeSH
• prevalence MeSH
• protilátky protozoální krev   MeSH
• séroepidemiologické studie MeSH
• Toxoplasma izolace a purifikace   MeSH
• toxoplazmóza zvířat epidemiologie   parazitologie   MeSH
• zvířata MeSH
• Check Tag
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• Geografické názvy
• Česká republika epidemiologie   MeSH