Sergii Antoniak

Dr. Sergii Antoniak

orcid

Research Focus & Metrics

Academic Career Length

16Years (2011-Present)

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

Representative Publications

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26 October 2021 in HIV Medicine
Verified
Journal Article
Open access
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DJDavid Jilich
David Jilich
ASAgata Skrzat-Klapaczyńska
Agata Skrzat-Klapaczyńska
LFLukas Fleischhans
Lukas Fleischhans
DBDominik Bursa
Dominik Bursa
SASergii Antoniak
Sergii Antoniak
FGfor the ECEE Network Group
for the ECEE Network Group
Introduction: People living with HIV (PLWH) are at higher risk of poorer COVID‐19 outcomes. Vaccination is a safe and effective method of prevention against many infectious diseases, including COVID‐19. Here we investigate the strategies for national COVID‐19 vaccination programmes across central and eastern Europe and the inclusion of PLWH in vaccination programmes.Methods: The Euroguidelines in Central and Eastern Europe Network Group consists of experts in the field of infectious diseases from 24 countries in the region. Between 1 November 2020 and 19 March 2021 the group proceeded an on‐line survey consisting of 20 questions.Results: Twenty‐two countries (out of 24 invited) participated in the survey and 20/22 countries in the period between December 2020 and March 2021 had already started their COVID‐19 vaccination programme. In total, seven different vaccines were used by participating countries. In 17/21 countries (81%), vaccinated persons were centralized within the national registry. In 8/21 countries (38%) PLWH were prioritized for vaccination (the Czech Republic, Greece, Hungary, Lithuania, Montenegro, Romania, Slovakia, Slovenia) and the Czech Republic, Greece and Serbia had put in place national guidelines for vaccination of PLWH. In 14/20 countries (70%) vaccination was only provided by designated centres. Eighteen respondents (18/21; 85.7%) reported that they planned to follow up HIV patients vaccinated against COVID‐19, mainly by measuring antibody levels and checking COVID‐19 incidence (11/21; 52.3%).Conclusions: This survey‐based study suggests that there are significant differences in terms of prioritizing PLWH, the types of vaccines used, vaccination coverage, and the development and implementation of a vaccination programmes within the region. Regardless of heterogenicity and existing barriers within the region, systematic vaccination in PLWH should have the highest priority, especially in those with severe immunodeficiency, risk factors, and in the elderly, aiming for prompt and high vaccination coverage.

31 January 2011 in Journal of Antimicrobial Chemotherapy
Verified
Journal Article
Open access
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WBWendy P. Bannister
Wendy P. Bannister
JKJ. Kjaer
J. Kjaer
APA. Phillips
A. Phillips
OGon behalf of the EuroSIDA group
on behalf of the EuroSIDA group
MLM. Losso
M. Losso
JKJesper KjæR
Jesper KjæR
Estimating the prevalence of accumulated HIV drug resistance in patients receiving antiretroviral therapy (ART) is difficult due to lack of resistance testing at all occasions of virological failure and in patients with undetectable viral load. A method to estimate this for 6498 EuroSIDA patients who were under follow-up on ART at 1 July 2008 was therefore developed by imputing data on patients with no prior resistance test results, based on the probability of detecting resistance in tested patients with similar profiles. Using all resistance test results available, predicted intermediate/high-level resistance to specific drug classes [nucleoside reverse transcriptase inhibitors (NRTIs), non-nucleoside reverse transcriptase inhibitors (NNRTIs) and protease inhibitors (PIs)] was derived using the Stanford algorithm v5.1.2. Logistic regression models were then employed to estimate predicted probability of resistance to each drug class for given values of current viral load, history of virological failure and previous virological suppression. Based on these predicted probabilities and patients’ covariate profiles, estimates of prevalence in 5355 patients with no prior test results were obtained. Overall prevalence of resistance was estimated by pooling these data with those observed in the remaining 1143 tested patients. Prevalence of NRTI, NNRTI and PI resistance was estimated as 43% (95% confidence interval: 39%–46%), 15% (13%–18%) and 25% (22%–28%), respectively. This method provides estimates for the proportion of treated patients in a cohort who harbour resistance on a given date, which are less likely to be affected by selection bias due to missing resistance data and will allow us to estimate prevalence of resistance to different drug classes at specific timepoints in HIV-infected populations on ART.

14 May 2023 in Vaccines
Verified
Journal Article
Open access
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KAKerstin Aimla
Kerstin Aimla
Justyna Dominika KowalskaJustyna Dominika Kowalska
Justyna Dominika Kowalska
RMRaimonda Matulionyte
Raimonda Matulionyte
VMVelida Mulabdic
Velida Mulabdic
VAVassilenko Anna
Vassilenko Anna
ASAgata Skrzat-Klapaczyńska
Agata Skrzat-Klapaczyńska
(1) Background: Viral hepatitis C (HCV) and viral hepatitis B (HBV) are common co-infections in people living with HIV (PLWH). All PLWH should be vaccinated against HBV and hepatitis A (HAV) and treated for HBV and HCV. We aimed to compare testing, prophylaxis and treatment of viral hepatitis in PLWH in Central and Eastern Europe (CEE) in 2019 and 2022. (2) Methods: Data was collected through two on-line surveys conducted in 2019 and 2022 among 18 countries of the Euroguidelines in CEE (ECEE) Network Group. (3) Results: In all 18 countries the standard of care was to screen all PLWH for HBV and HCV both years; screening of HAV was routine in 2019 in 54.5% and in 2022 47.4% of clinics. Vaccination of PLWH against HAV was available in 2019 in 16.7%, in 2022 in 22.2% countries. Vaccination against HBV was available routinely and free of charge in 50% of clinics both in 2019 and 2022. In HIV/HBV co-infected the choice of NRTI was tenofovir-based in 94.4% of countries in both years. All clinics that responded had access to direct-acting antivirals (DAAs) but 50% still had limitations for treatment. (4) Conclusions: Although testing for HBV and HCV was good, testing for HAV is insufficient. Vaccination against HBV and especially against HAV has room for improvement; furthermore, HCV treatment access needs to overcome restrictions.

BMBartłomiej Matłosz
Bartłomiej Matłosz
ASAgata Skrzat-Klapaczyńska
Agata Skrzat-Klapaczyńska
SASergii Antoniak
Sergii Antoniak
TBTatevik Balayan
Tatevik Balayan
JBJosip Begovac
Josip Begovac
Justyna Dominika KowalskaJustyna Dominika Kowalska
Justyna Dominika Kowalska
Chronic kidney disease (CKD) is a significant cause of morbidity and mortality among patients infected with human immunodeficiency virus (HIV). The Central and East Europe (CEE) region consists of countries with highly diversified HIV epidemics, health care systems and socioeconomic status. The aim of the present study was to describe variations in CKD burden and care between countries. The Euroguidelines in the CEE Network Group includes 19 countries and was initiated to improve the standard of care for HIV infection in the region. Information on kidney care in HIV-positive patients was collected through online surveys sent to all members of the Network Group. Almost all centres use regular screening for CKD in all HIV (+) patients. Basic diagnostic tests for kidney function are available in the majority of centres. The most commonly used method for eGFR calculation is the Cockcroft–Gault equation. Nephrology consultation is available in all centres. The median frequency of CKD was 5% and the main cause was comorbidity. Haemodialysis was the only modality of treatment for kidney failure available in all ECEE countries. Only 39% of centres declared that all treatment options are available for HIV+ patients. The most commonly indicated barrier in kidney care was patients’ noncompliance. In the CEE region, people living with HIV have full access to screening for kidney disease but there are important limitations in treatment. The choice of dialysis modality and access to kidney transplantation are limited. The main burden of kidney disease is unrelated to HIV infection. Patient care can be significantly improved by addressing noncompliance.

19 July 2024 in PLOS ONE
Verified
Journal Article
Open access
PDF file
TOTaylor D. Ottesen
Taylor D. Ottesen
Jeffrey A. WickershamJeffrey A. Wickersham
Jeffrey A. Wickersham
JLJuliana C. Lawrence
Juliana C. Lawrence
SASergii Antoniak
Sergii Antoniak
OZOleksandr Zezuilin
Oleksandr Zezuilin
FAFredrick L. Altice
Fredrick L. Altice
Background: HIV incidence and mortality are increasing in Ukraine despite their reductions globally, in part due to suboptimal antiretroviral therapy (ART) coverage in key populations of people with HIV (PWH) where the epidemic is concentrated. As physicians are gatekeepers to ART prescription, stigma and discrimination barriers are understudied as a key to meeting HIV treatment targets in key populations. Methods: A national sample (N = 204) of ART-prescribing physicians in Ukraine were surveyed between August and November 2019. Participants underwent a series of randomized, hypothetical HIV clinical scenarios and decided whether to initiate or defer (or withhold) ART. Scenarios varied based on 5 distinct CD4 counts (CD4: 17, 176, 305, 470, or 520 cells/mL) and 10 different PWH key populations. Z scores and McNemar’s test for paired samples were used to assess differences between key populations and CD4 count. Feeling thermometers were used to assess stigma-related measures toward key populations among physicians. Results: Physicians were highly experienced (mean = 19 years) HIV treaters, female (80.4%), and trained in infectious diseases (76.5%). Patients who drink alcohol (range: 21.6%-23.5%) or use (PWUD range: 16.7%-20.1%) or inject (PWID range: 15.5%-20.1%) drugs were most likely to have ART deferred, even at AIDS-defining CD4 counts. PWID maintained on methadone, however, were significantly (p<0.001) less likely to have ART deferred compared with those who were not (range: 7.8%-12.7%) on methadone. Men who have sex with men (range: 5.4%-10.8%), transgender women (range: 4.9%-11.3%), sex workers (range: 3.9%-10.3%),and having an HIV-uninfected sex partner (range: 3.9%-9.3%) had the lowest likelihood of ART deferral. Increasing levels of stigma (i.e., feeling thermometers) towards a key population was correlated with ART deferral (i.e., discrimination). Conclusions: Despite international and Ukrainian guidelines recommending ART prescription for all PWH, irrespective of risk or CD4 count, ART deferral by experienced HIV experts remains high in certain key populations, especially in PWH and substance use disorders. Strategies that initiate ART immediately after diagnosis (i.e., rapid start antiretroviral therapy), independent of risk group, should be prioritized to truly mitigate the current epidemic.

5 May 2022 in Viruses
Verified
Journal Article
Open access
PDF file
Justyna Dominika KowalskaJustyna Dominika Kowalska
Justyna Dominika Kowalska
Carlo BieńkowskiCarlo Bieńkowski
Carlo Bieńkowski
LFLukas Fleischhans
Lukas Fleischhans
SASergii Antoniak
Sergii Antoniak
ASAgata Skrzat-Klapaczyńska
Agata Skrzat-Klapaczyńska
AHAndrzej Horban
Andrzej Horban
HIV-positive patients may present lungs with multiple infections, which may hinder differential diagnoses and the choice of treatment in the course of COVID-19, especially in countries with limited access to high-standard healthcare. Here, we aim to investigate the association between radiological changes and poor COVID-19 outcomes among HIV-positive patients from Central and Eastern Europe. Between November 2020 and May 2021, the Euroguidelines in Central and Eastern Europe Network Group started collecting observational data on HIV and COVID-19 co-infections. In total, 16 countries from Central and Eastern European submitted data (eCRF) on 557 HIV-positive patients. The current analyses included patients who had a radiological examination performed. Logistic regression models were used to identify the factors associated with death, ICU admission, and partial recovery (poor COVID-19 outcomes). Factors that were significant in the univariate models (p < 0.1) were included in the multivariate model. Radiological data were available for 224 (40.2%) patients, 108 (48.2%) had computed tomography, and 116 (51.8%) had a chest X-ray. Of these, 211 (94.2%) were diagnosed using RT-PCR tests, 212 (94.6%) were symptomatic, 123 (55.6%) were hospitalized, 37 (16.6%) required oxygen therapy, and 28 (13.1%) either died, were admitted to ICU, or only partially recovered. From the radiologist’s description, 138 (61.6%) patients had typical radiological changes, 18 (8.0%) atypical changes, and 68 (30.4%) no changes. In the univariate models, CD4 count (OR = 0.86 [95% CI: 0.76–0.98]), having a comorbidity (2.33 [1.43–3.80]), HCV and/or HBV co-infection (3.17 [1.32–7.60]), being currently employed (0.31 [0.13–0.70]), being on antiretroviral therapy (0.22 [0.08–0.63]), and having typical (3.90 [1.12–13.65]) or atypical (10.8 [2.23–52.5]) radiological changes were all significantly associated with poor COVID-19 outcomes. In the multivariate model, being on antiretroviral therapy (OR = 0.20 [95% CI:0.05–0.80]) decreased the odds of poor COVID-19 outcomes, while having a comorbidity (2.12 [1.20–3.72]) or either typical (4.23 [1.05–17.0]) or atypical (6.39 [1.03–39.7]) radiological changes (vs. no changes) increased the odds of poor COVID-19 outcomes. Among HIV patients diagnosed with symptomatic SARS-CoV-2 infection, the presence of either typical or atypical radiological COVID-19 changes independently predicted poorer outcomes.