Vaccination status in patients at risk for invasive disease with encapsulated bacteria at a children's hospital in the City of Buenos Aires.

Introduction. The Ministry of Health has established specific vaccines for people at high risk for invasive infections with encapsulated bacteria (EB). There is currently no information about compliance with the vaccination schedule. Our objective was to assess EB vaccination status in subjects ≤ 18 years with risk factors. Population and methods. Observational, analytical study with a survey to parents of subjects aged ≤ 18 years with HIV, asplenia and/or complement deficiency attending a vaccination center at a children's hospital between October 2020 and September 2021. Sociodemographic and clinical data were collected. Their vaccination status for the EB pneumococcus, meningococcus, and Haemophilus influenzae type b (Hib), their regular vaccination and flu vaccination schedules were assessed. The vaccine hesitancy scale (VHS) was administered: range 10-50. The association between the study variables and EB vaccination was analyzed using logistic regression (OR, 95% CI). The REDCap® database and the STATA ® v.14 software were used. Results. A total of 104 subjects participated; mean age: 9.9 years (SD: 4.4). Asplenia: 91.3%, HIV: 7.6%, and complement deficiency: 0.9%. Socioeconomic level: relative poverty: 38.4%, followed by middle class: 37.5%. Complete vaccination status: meningococcal vaccine 45%, pneumococcal vaccine: 42%, Hib: 97%. The regular vaccination and flu vaccination schedules were up-to-date in 77.9% and 61.5% of cases, respectively. Mean VHS score: 41.9 (SD: 3.2). No significant associations were observed between variables and EB vaccination status. Conclusions. A high percentage of subjects had not completed neither their EB vaccination nor their regular or their flu vaccination schedules. Caregivers' confidence in vaccines was high.