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The first record of mcr-1 gene for colistin resistance in pigs from Serbia: should we be worried?

100%
Kozoderovic G., Lalosevic V., Suli T., Vracar V.
Polish Journal of Veterinary Sciences
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2022
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tom 25
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nr 3
Colistin is being used as a last-resort drug to treat infections caused by multidrug-resistant (MDR) bacteria in humans. In veterinary medicine, colistin has been used for the treatment and prevention of infectious diseases. In the first study of mcr genes by multiplex PCR in healthy pigs from Serbia, we discovered mcr-1 in 4.85% out of 350 fecal samples. The presence of mcr-1 gene was detected on three farms located less than 100 km apart from each other, predominantly in piglet samples. The results point to the necessity of monitoring of colistin resistance and the mcr genes in food producing animals as well as restricting colistin usage on farms.
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Virus neutralization test for confirmation of ELISA-positive SARS-CoV-2 antibodies in dogs

64%
Vujin D., Knezevic A., Vracar V., Petrovic D., Kozoderovic G., Spasojevic Kosic L. J., Lalosevic V., Lalosevic D.
Polish Journal of Veterinary Sciences
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2024
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tom 27
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nr 4
Constant antigenic changes, new variants and easy transmission of SARS-CoV-2 virus should acquire greater zoonotic attention and need to remain alert. In this retrospective study the aim was to analyze seropositivity to SARS-CoV-2 in dogs by commercial ELISA. The Virus neutralization test (VNT) was modified for the purpose of confirmation of SARS-CoV-2 antibodies in ELISA-positive dog sera. The sera were collected from 204 dogs from different veterinary clinics across Vojvodina Province, Serbia, during COVID-19 pandemic. For the screening of antibodies a commercial double multi-species antigen ELISA was used, followed by the VNT modified with SARS-CoV-2 as a confirmatory test. VNT was modified as “one step” test using local isolate of SARS-CoV-2 and the results were checked by cytopathic effect in cell culture on the 96-well microtiter plate. Obtained data have shown that 9 out of 204 dogs were positive by ELISA (4.4%), while 2 (0.97%) sera were doubtful. VNT confirmed 9 positive dogs, but 2 doubtful samples were negative, exhibiting the seroconversion to SARS-CoV-2 in 4.4% dogs from Vojvodina region during pandemic of COVID-19. VNT with SARS-CoV-2 helped to elucidate ELISA ambiguous results. The occurrence of antibodies to SARS-CoV-2 in dogs in this study during COVID-19 pandemic suggested the possibility of viral transmission to dogs, implicating the potential for zoonotic transmission. This was the first research on seroconversion to SARS-CoV-2 in dogs from the Province of Vojvodina, the northernmost part of Serbia.
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