This article examines the impact of post-COVID syndrome on post-vaccination immunity to the measles virus in children. A total of 89 children undergoing outpatient and inpatient treatment were examined between 2024 and 2025. Post-COVID syndrome was diagnosed by ELISA testing for IgG antibodies to SARS-CoV-2, and immunity to measles was assessed using the VectoMeasles-IgG ELISA test. A decrease in measles-specific antibody titers was found in previously vaccinated children with post-COVID syndrome. The study highlights the importance of monitoring and revaccination in cases of seronegative results.

measles, vaccination, post-vaccination immunity, post-COVID syndrome, IgG antibodies, SARS-CoV-2, ELISA, children, revaccination, immune status, VectoMeasles, epidemiology, seronegativity, post-COVID immunity, prevention

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