Olga Horvat

Dr. Olga Horvat


Research Focus & Metrics

Academic Career Length

19Years (2008-Present)

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

Representative Publications

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ATAna Tomas
Ana Tomas
Nebojsa PavlovicNebojsa Pavlovic
Nebojsa Pavlovic
NSNebojsa Stilinovic
Nebojsa Stilinovic
NLNikola Lalović
Nikola Lalović
MKMilica Paut Kusturica
Milica Paut Kusturica
Olga HorvatOlga Horvat
Olga Horvat
Background. Attitudes towards conventional and complementary medicine among future healthcare professionals can impact their future pharmacotherapy practice. This study aimed to determine the prevalence and predisposing factors related to self-medication among medical and pharmacy students. Methods. This cross-sectional questionnaire-based study was performed at the Faculty of Medicine, University of Novi Sad, Serbia, on first- and final-year students of medicine and pharmacy. The multivariate Poisson regression model with robust variance was used to identify the main predictors of self-medication. Results. The overall self-medication prevalence in the past year was 81.3%. Independent risk factors for self-medication identified in the regression analysis were the final study year, housing condition, i.e., living in a leased apartment or in a student dormitory in comparison to living with parents, and cigarette consumption. The conventional drugs were the most frequently used, mostly for the symptoms of cold and pain. Final-year students had more confidence in conventional medicines than in herbal drugs and were more aware of the risks of their concomitant use. Conclusion. Self-medication is highly prevalent among students of medical sciences, especially among final-year students. Increased medical knowledge led to the higher awareness of the drug interaction risks.

10 July 2017 in PLOS ONE
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Journal Article
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Olga HorvatOlga Horvat
Olga Horvat
ATAna D Tomas
Ana D Tomas
MKMilica M Paut Kusturica
Milica M Paut Kusturica
ASAlisa V Savkov
Alisa V Savkov
DBDragica U Bukumirić
Dragica U Bukumirić
ASAna J Sabo
Ana J Sabo
The objective of this study was to investigate the knowledge, attitudes and behavior regarding antibiotics of the general population. The study sample consisted of adult subjects who consulted general practitioners at health centers in Serbia and agreed to complete the questionnaire. A total of 668 questionnaires were distributed; 500 respondents completed the entire questionnaire (response rate 74.85%). The average age was 51.65 ± 16.56 years, 60.80% of the respondents were women. The median antibiotic knowledge score was 9. Predictors of adequate antibiotic knowledge were higher education level and a family member whose ocuppation was related to health-care. Overall, 58.4% of respondents believed that antibiotics could be used to treat common cold. Around a half of the respondents (47.2%) self-medicated with antibiotics at least once during their life-time, and around a quarter (24.2%) during the last treatment of infection. Patients with inadequate knowledge had 3 times higher chances of self-medicating with antibiotics compared to those with adequate knowledge. Although 98.20% of respondents claimed that antibiotic treatment should be started after a visit to a doctor and receiving a prescription, only 65.8% obtained antibiotics with prescription from a doctor during the last infection. Although these results demonstrate that respondents had a relatively adequate level of knowledge regarding antibiotics use, some areas of misconceptions and improper behavior were identified. Therefore, further rationalization should be focused on educational campaigns targeting the behavior of patients with regard to antibiotic use.

6 January 2025 in Antibiotics
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Olga HorvatOlga Horvat
Olga Horvat
ZKZorana Kovacevic
Zorana Kovacevic
Antimicrobial resistance (AMR) represents a critical threat to human, animal, and environmental health, challenging global efforts to maintain sustainable ecosystems and public health systems. In this review, the complex, cross-disciplinary issues of AMR are explored within the framework of planetary health, emphasizing the interconnectedness of human and veterinary medicine with broader environmental and social systems. Specifically, it addresses the social, economic, environmental, and health dimensions of AMR under the planetary health framework. The social aspects consider how public awareness, education, and healthcare practices shape antimicrobial use (AMU) and resistance patterns. The economic impact evaluates the cost burdens of AMR, including healthcare costs, loss of productivity, and the implications for the livestock and food production industries. The environmental dimension highlights the role of pharmaceutical waste, agricultural runoff, and industrial pollution in contributing to the spread of antimicrobials and resistant pathogens in ecosystems. To illustrate these challenges, a comprehensive literature review using the PubMed and Web of Science databases was conducted, identifying 91 relevant articles on planetary health and AMR. In this review, the knowledge from these studies and additional references is integrated to provide a holistic overview of the AMR crisis. By applying the four pillars of planetary health—social, economic, environmental, and health knowledge—in this manuscript, the necessity is underscored of collaborative strategies across human and veterinary medicine to combat AMR. Ultimately, this synergistic approach aims to shape the policies and practices that safeguard public health, protect ecosystems, and promote a sustainable future by implementing antimicrobial stewardship programs and encouraging prudent AMU.

20 December 2022 in Antibiotics
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ZKZorana Kovacevic
Zorana Kovacevic
MSMarko Samardžija
Marko Samardžija
Olga HorvatOlga Horvat
Olga Horvat
DTDragana Tomanić
Dragana Tomanić
MRMiodrag Radinović
Miodrag Radinović
NKNebojša Kladar
Nebojša Kladar
Antimicrobials have had an important impact on animal health and production performance. However, non-prudent antimicrobial use (AMU) in food producing animals is considered to contribute to the emergence of antimicrobial resistance (AMR), with a potential impact on both animal and public health. Considering the global importance of AMR, and the threats and challenges posed by mastitis and mastitis therapy in livestock production, the main objective of this study was to quantify AMU on three dairy farms in Serbia and to examine whether there is an association between AMU and the emergence of antimicrobial resistance of mastitis-associated pathogens. Antimicrobial susceptibility testing was performed by the disk diffusion method using causative agents isolated from the milk samples of 247 dairy cows. AMU data were obtained for a one-year period (May 2021 to May 2022) based on antibiotic prescriptions listed in electronic databases kept by farm veterinarians. To estimate antimicrobial drug exposure at the farm level, the veterinary drug Defined Daily Dose was calculated by multiplying the total amount of antibiotic used on the farms during the study period by the quantity of antibiotic in the administered drug and number of original drug packages used. The results on the association between the use of common antibiotics in mastitis treatment and AMR of isolated mastitis-associated pathogens confirm a pattern that could raise awareness of the importance of this aspect of good veterinary and clinical practice to combat the global threat of AMR.

22 December 2022 in Antibiotics
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ZKZorana Kovacevic
Zorana Kovacevic
JMJovan Mihajlović
Jovan Mihajlović
SMSnežana Mugoša
Snežana Mugoša
Olga HorvatOlga Horvat
Olga Horvat
DTDragana Tomanić
Dragana Tomanić
MSMarko Samardžija
Marko Samardžija
Mastitis in dairy cows is responsible for major economic losses on dairy farms worldwide as the most expensive and prevalent disease in dairy cattle. In spite of the fact that antibiotic therapy still remains the main treatment strategy for bovine mastitis, concerns about the shortcomings of this treatment approach are continuously raised. Hence, research on alternative treatments with increased effectiveness and reduced costs is needed. Therefore, we conducted a pharmacoeconomic analysis of conventional antibiotic vs. a proposed Phyto-Bomat treatment based on essential oils in bovine mastitis therapy. Treatments were compared from the farmer’s perspective in the domain of costs (expressed in total, direct and indirect, cost differences) and effectiveness (expressed in daily milk yield differences). Economic calculations were based on data from a dairy farm in Serbia. The average cost of conventional antibiotic treatment was estimated at EUR 80.32 consisting of therapy costs, veterinary services and milk rejection costs at EUR 16.54, EUR 17.68 and EUR 46.10, respectively. The average cost of Phyto-Bomat treatment was estimated at EUR 76.34 with therapy costs of EUR 34.34, veterinary costs of EUR 32.00 and rejection of milk costs of only EUR 10.00. Therefore, Phyto-Bomat results in cost savings approximating EUR 4 per each mastitis episode with the highest cost reductions obtained in milk rejection costs. This estimation of Phyto-Bomat’s economic benefits could be used as a starting point for the inclusion of this formulation as an alternative treatment approach with a focus on subclinical mastitis since it contributes to most of the financial losses.

7 April 2021 in Antibiotics
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Journal Article
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ATAna Tomas
Ana Tomas
Nebojsa PavlovicNebojsa Pavlovic
Nebojsa Pavlovic
NSNebojsa Stilinovic
Nebojsa Stilinovic
Olga HorvatOlga Horvat
Olga Horvat
MKMilica Paut Kusturica
Milica Paut Kusturica
ASAna Sabo
Ana Sabo
The aim of this study was to determine and describe trends in antibiotics utilization in Serbia over a ten-year period. Data were retrieved from publicly available annual reports (2010–2019). The results were expressed as Defined Daily Dose (DDD) per 1000 inhabitants per day (DID). All calculations were performed using the DDD values for the 2020 Anatomical Therapeutic Chemical/Defined Daily Dose (ATC/DDD) version for each year of the study, to account for the DDD changes during the study period. Antibiotics were classified using the WHO Access, Watch, Reserve (AWaRe) classification. Total utilization of antibacterials for systemic use increased from 17.25 DID in 2010 to 28.65 DID in 2019. A statistically significant increasing trend in the use of the Watch category antibiotics was observed. A tendency towards use of broad-spectrum antibiotics, apparent by a statistically significant increase in the rate of utilization of broad-spectrum macrolides, quinolones and third-generation cephalosporins vs. narrow-spectrum ones, as well as a significant increasing trend in the use of quinolones was identified. Total antibiotic utilization was found to be well above the European average. Several specific problem areas were identified, which requires further efforts to improve antibiotic prescribing. The present study provides the information needed to facilitate antibiotic stewardship in Serbia further and proposes specific interventions to optimize antibiotic use in Serbia.