Tamara Kozytska

Dr. Tamara Kozytska

Institut für bakterielle Infektionen und Zoonosen, Friedrich-Loeffler-Institut, Jena, Thuringia, Germany
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Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 May 2023 in Microorganisms
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Tamara KozytskaTamara Kozytska
Tamara Kozytska
MBMarwa Bassiouny
Marwa Bassiouny
OCOlha Chechet
Olha Chechet
DODiana Ordynska
Diana Ordynska
Domenico GalanteDomenico Galante
Domenico Galante
Gamal WarethGamal Wareth
Gamal Wareth
Anthrax is an acute infectious zoonotic disease caused by Bacillus anthracis that mostly affects grazing livestock and wildlife. Furthermore, B. anthracis is considered one of the most important biological agents of bioterrorism that could also be potentially misused in biological weapons. The distribution of anthrax in domestic animals and wildlife in Europe with a particular focus on Ukraine as a country of war was analyzed. Between 2005 and 2022, 267 anthrax cases were registered at the World Organization of Animal Health (WOAH) in animals in Europe, including 251 cases in domestic animals and 16 in wildlife. The highest numbers of cases were recorded in 2005 and 2016 followed by 2008, and the highest numbers of registered cases were reported from Albania, Russia, and Italy. In Ukraine, anthrax is currently a sporadic infection. Since 2007, 28 notifications were registered, with isolates mainly from soil samples. The highest number of confirmed anthrax cases was registered in 2018, and Odesa, which is close to Moldova, had the highest number of cases, followed by the Cherkasy region. The presence of thousands of biothermal pits and burial grounds of fallen cattle nationwide favors the re-emergence of new foci. Most confirmed cases were in cattle; however, single cases were confirmed in dogs, horses, and pigs. Further investigation of the disease in wildlife and in environmental samples is needed. The genetic analysis of isolates, investigation of susceptibility to antimicrobial compounds, and determination of virulence and pathogenicity factors are required in this volatile region of the world for awareness raising and preparedness.

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SASaranya Adukkadukkam
Saranya Adukkadukkam
HBHanka Brangsch
Hanka Brangsch
Tamara KozytskaTamara Kozytska
Tamara Kozytska
SKSonika Kar
Sonika Kar
PRPavithra Rajkumar
Pavithra Rajkumar
JMJayaseelan Murugaiyan
Jayaseelan Murugaiyan
Acinetobacter (A.) baumannii is an important multidrug-resistant pathogen increasingly recognized across animal and environmental settings, and carbapenem-resistant A. baumannii (CRAB) is classified as a critical-priority pathogen by the World Health Organization. This study investigated the antimicrobial resistance (AMR) and genomic characteristics of 122 A. baumannii isolates comprising 72 veterinary and 50 environmental isolates collected in Andhra Pradesh, India. Antimicrobial susceptibility testing, whole-genome sequencing (WGS), resistance and virulence gene profiling, multilocus sequence typing (MLST), core-genome analysis, single nucleotide polymorphism (SNP) phylogeny, and pan-genome analysis were performed. Overall, 58.2% of isolates were multidrug-resistant (MDR), and 41.8% were extensively drug-resistant (XDR). Sequence type (ST) 52 predominated among veterinary isolates, whereas ST2 was more frequent among environmental isolates. The presence of carbapenem-resistant isolates along with the ST2 lineage enhances the similarity to clinical A. baumannii. Several intrinsic resistance genes, including blaOXA-23, armA, aph(3″)-Ib, aph(6)-Id, tet(B), mph(E), and msr(E), were more prevalent in the ST2-associated population. Virulence-associated determinants were widely conserved. Core-genome MLST (cgMLST) and core-genome SNP (cgSNP) analyses identified highly related isolates within both lineages, while pairwise SNP differences were 0–7. Pan-genome analysis identified 4204 gene clusters and distinct accessory gene patterns between ST2 and ST52. These findings indicate that resistance gene distribution was closely associated with lineage structure and support integrated genomic surveillance of A. baumannii across animal and environmental reservoirs.

22 August 2020 in Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies. Series: Veterinary Sciences
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IAI. M. Azyrkina
I. M. Azyrkina
TGT. A. Garkavenko
T. A. Garkavenko
Tamara KozytskaTamara Kozytska
Tamara Kozytska
LSL. O. Shalimova
L. O. Shalimova
Antibiotics are widely used to stimulate the growth of poultry raised for human consumption, as well as therapeutically for the treatment of infectious diseases of poultry. The indiscriminate use of antibiotic growth stimulants in chicken diets continues to pose a threat to human health. However, because the burden of infectious diseases in poultry is high, the abolition of the use of antibiotics without alternatives will lead to the spread of infections that have serious consequences for food safety and human health. One of the priorities of the state policy on nutrition in the field of health care is to ensure food safety. The aim of the study was to determine the residual amount of antibiotics in poultry meat, liver and kidneys. To validate a qualitatively new screening microbiological method to determine the residual amount of the bacitracin group in poultry products. Material and methods. The limits of sensitivity, accuracy and specificity were established by microbiological method for determining the residual amount of the bacitracin group. The study was performed in 20 replicates of meat, liver and kidney samples that do not contain antibiotics, as well as in samples with the addition of antibiotics of the bacitracin group in concentrations ½ MRL and MRL. Results of research and discussion. Pure inhibition zones with growth of Micrococcus flavus ATCC 10240 test culture were found in the samples without the addition of antibiotics, and inhibition zones ranging from 18.03 ± 0.03 mm to 18.08 ± 0.04 mm were present near the standard of antibiotics. It was found that when adding an antibiotic of the bacitracin group to poultry products, were present around the wells of the inhibition zone of the test culture Micrococcus flavus ATCC 10240. The lowest level of residue determination (½MRL) for poultry, kidney and liver is 10.0 μg/kg , MRL 20.0 μg/kg in accordance with the requirements of national legislation by order of the Ministry of Health of Ukraine Poultry meat safety parameters from 06.08.2013 № 695. Conclusions and prospects for further research. The specificity, accuracy and sensitivity of this method is 100 %, which allows to detect ½ maximum permissible levels of residual amounts of antibiotics of the bacitracin group in accordance with the requirements of national legislation.