Evolution of seroprevalence to SARS-CoV-2 in blood donors in Sarajevo Canton, Federation of Bosnia and Herzegovina: Cross-sectional and longitudinal studies.

Background: Sarajevo Canton in the Federation of Bosnia and Herzegovina has recorded several waves of high SARS-CoV-2 transmission and has struggled to reach adequate vaccination coverage. We describe the evolution of infection- and vaccine-induced SARS-CoV-2 antibody response and persistence. Methods: We conducted repeated cross-sectional analyses of blood donors aged 18-65 years in Sarajevo Canton in November-December 2020 and 2021. We analyzed serum samples for anti-nucleocapsid (anti-N) and anti-spike (anti-S) antibodies. To assess immune durability, we conducted longitudinal analyses of seropositive participants at 6 and 12 months. Results: One thousand fifteen participants were included in Phase 1 (November-December 2020) and 1152 in Phase 2 (November-December 2021). Seroprevalence increased significantly from 19.2% (95% CI: 17.2%-21.4%) in Phase 1 to 91.6% (95% CI: 89.8%-93.1%) in Phase 2. Anti-S IgG titers were significantly higher among vaccinated (58.5%) than unvaccinated infected participants across vaccine products (p < 0.001), though highest among those who received an mRNA vaccine. At 6 months, 78/82 (95.1%) participants maintained anti-spike seropositivity; at 12 months, 58/58 (100.0%) participants were seropositive, and 33 (56.9%) had completed the primary vaccine series within 6 months. Among 11 unvaccinated participants who were not re-infected at 12 months, anti-S IgG declined from median 770.1 (IQR 615.0-1321.7) to 290.8 (IQR 175.7-400.3). Anti-N IgG antibodies waned earlier, from 35.4% seropositive at 6 months to 24.1% at 12 months. Conclusions: SARS-CoV-2 seroprevalence increased significantly over 12 months from end of 2020 to end of 2021. Although individuals with previous infection may have residual protection, COVID-19 vaccination is vital to strengthening population immunity.

The role of National Immunization Technical Advisory Groups in advising COVID-19 immunization policy during the pandemic: lessons from the Federation of Bosnia and Herzegovina.

A National Immunization Technical Advisory Group (NITAG) is a multi-disciplinary body of experts that provides evidence-based recommendations on immunizations to policy-makers to assist them in making immunization policy and program decisions. NITAGs faced challenges in making evidence-based recommendations for COVID-19 vaccines during the COVID-19 pandemic due to the new vaccine products available in a short time period and limited available data on vaccine effectiveness and vaccine safety. The authors reviewed the process used by the NITAG in the Federation of Bosnia and Herzegovina, called the expert body, to develop COVID-19 vaccine recommendations. The article reviews the evidence that was considered by the expert body when developing 23 recommendations on COVID-19 vaccination and describes the challenges and successes faced by the body. The expert body recommendations led to the successful roll-out of COVID-19 vaccines and provided guidance for COVID-19 vaccination during the pandemic. The expert body plans to improve its work and procedures for developing routine immunization recommendations with the support of the WHO Regional Office for Europe.

Population Perspectives on Impact of the COVID-19 Pandemic on Essential Health Services-Behavioral Insights from the Federation of Bosnia and Herzegovina.

The aim of this study was to analyze the impact of the COVID-19 pandemic on patterns of use of essential health services (EHS), health-seeking behaviors, and population health and wellbeing in the Federation of Bosnia and Herzegovina (FBiH) from the perspective of its adult population. A population-based survey was implemented in the FBiH in December 2020 on a sample of 1068 adults. Overall, 64% of respondents received care, significantly more being women (67% vs. 61%, p = 0.046), those with a chronic disease (CD) (75% vs. 65%, p < 0.001), and of an older age (58% in 18−34 vs. 67% in older, p = 0.031). These groups also postponed care more often (39% in 55+ vs. 31% in 18−34 years old, p = 0.01; 55% with CD vs. 31% without, p < 0.001; and 43% in females vs. 32% males, p < 0.001). Main reasons for postponing care were lack of available appointments and fear of infection. The presence of a CD was the strongest predictor of need, access, and disruptions of health care. Respondents reported increased expenses for medicines (40%) and health services (30%). The findings of the survey add user insights into EHS disruptions to existing health statistics and other data and may be used to inform strategies for mitigating the impact of COVID-19 on the disruption of health care services, strengthening health system preparedness and building resilience for future emergencies.

Satisfaction with Health Care Services in the Adult Population of the Federation of Bosnia and Herzegovina during the COVID-19 Pandemic.

Background and Objectives: Patient satisfaction with health care can influence health care-seeking behavior in relation to both minor or major health problems or influence communication and compliance with medical advice, which is especially important in emergencies such as the COVID-19 pandemic. Thus, it is important to continually monitor patient satisfaction with provided care and their dynamics. The aim of this study was to assess patient satisfaction with health care during the COVID-19 pandemic in the adult population of the Federation of Bosnia and Herzegovina (FB&H) and compare it with levels of satisfaction in the same population before the COVID-19 pandemic. Materials and Methods: A representative, population-based survey was implemented in the adult population of the FB&H using the EUROPEP instrument, which measures satisfaction with health care using 23 items. The sample included 740 respondents who were 18 years or older residing in the FB&H and was implemented in December 2020. All data were collected using a system of online panels. The survey questions targeted the nine months from the beginning of the pandemic to the time of data collection, i.e., the period of March to December 2020. Results: The mean composite satisfaction score across all 23 items of the EUROPEP tool was 3.2 points in all age groups; the ceiling effect was 22% for the youngest respondents (18-34 years old), 23% for 35-54 years old, and 26% for the oldest group (55+), showing increasing satisfaction by age. The overall composite score for both females and males was 3.2. The ceiling effect was higher in those with chronic disease (29% vs. 23% in those without chronic disease). The composite mean score for respondents residing in rural vs. urban areas was 3.2 with a ceiling effect of 22% in rural and 24% in urban residents. When comparing mean composite scores surveyed at various points in time in the FB&H, it was found that the score increased from 3.3 to 3.5 between 2011 and 2017 and dropped again to 3.3 in this study. Despite these observations in the overall trends of satisfaction scores, we note that no statistically significant differences were observed between most of the single-item scores in the stratified analysis, pointing to the relative uniformity of satisfaction among the analyzed population subgroups. Conclusions: The rate of satisfaction with health care services in the FB&H was lower during the COVID-19 pandemic compared to 2011 and 2017. Furthermore, while an increasing trend in satisfaction with health care was observed in the FB&H during the years prior to 2020, the COVID-19 pandemic may have contributed to the reversal of this trend. It is important to further monitor the dynamics of patient satisfaction with health care, which could serve as a basis for planning, delivering, and maintaining quality services during the COVID-19 pandemic and other emergencies.

Household transmission of SARS-CoV-2: a prospective observational study in Bosnia and Herzegovina, August-December 2020.

BACKGROUND: The secondary attack rate (SAR) of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) was estimated, and the risk factors for infection among members of households with a coronavirus disease 2019 (COVID-19) index case were identified to inform preventive measures. METHODS: Between 3 August and 19 December 2020, a household transmission study was implemented based on a standardized World Health Organization protocol. Laboratory-confirmed cases of SARS-CoV-2 infection were recruited through the federal COVID-19 database. Trained contact tracers interviewed index cases and household members to collect information on demographic, clinical and behavioural factors. Contacts were followed up for 28 days to identify secondary infections. SAR was estimated and odds ratios (OR) were calculated for risk factors for transmission. RESULTS: In total, 383 households and 793 contacts were included in this study. The overall SAR was 17% [95% confidence interval (CI) 14-21]. Contacts had higher risk for infection if the primary case had both cough and runny nose (OR 4.31, 95% CI 1.60-11.63), if the contact was aged 18-49 years (OR 4.67, 95% CI 1.83-11.93), if the contact kissed the primary case (OR 3.16, 95% CI 1.19-8.43), or if the contact shared a meal with the primary case (OR 3.10, 95% CI 1.17-8.27). CONCLUSIONS: These results add to the global literature by providing evidence from a middle-income setting. Standard preventive measures in households with positive cases remain critical to reduce transmission.