Preventive effect of vaccination on long COVID in adolescents with SARS-CoV-2 infection

Vaccine. 2025 Dec 5:68:127907. doi: 10.1016/j.vaccine.2025.127907. Epub 2025 Nov 1.

Abstract

Purpose: In adolescents (12-17 years), it is unknown whether COVID-19 vaccination reduces progression from COVID-19 to Long COVID (LC) beyond preventing SARS-CoV-2 infection. We assessed the effect of vaccination among SARS-CoV-2 infected adolescents.

Methods and results: Participants were recruited from over 60 US healthcare and community settings. The exposure was any COVID-19 vaccination 6 months prior to infection. The outcome was LC defined using the LC research index. Vaccinated (n = 724) and unvaccinated (n = 507) adolescents were matched on sex, infection date, and enrollment date. The risk of LC was 36 % lower (95 % CI, 17 %, 50 %) in vaccinated compared to unvaccinated participants.

Conclusions: Vaccination reduces the risk of LC. Given the profound impact LC can have on the health and well-being of adolescents and the limited availability of treatments during this developmental stage, this supports vaccination as a strategy for preventing LC by demonstrating an important secondary prevention effect.

Keywords: Adolescent health; COVID-19; Long COVID; Secondary prevention; Vaccination.

MeSH terms

  • Adolescent
  • COVID-19 Vaccines* / administration & dosage
  • COVID-19 Vaccines* / immunology
  • COVID-19* / epidemiology
  • COVID-19* / immunology
  • COVID-19* / prevention & control
  • Child
  • Disease Progression
  • Female
  • Humans
  • Male
  • SARS-CoV-2 / immunology
  • United States / epidemiology
  • Vaccination*

Substances

  • COVID-19 Vaccines