Abstract
OBJECTIVES: Vaccination reduces the risk of acute coronavirus disease 2019 (COVID-19) in children, but it is less clear whether it protects against long COVID. We estimated vaccine effectiveness (VE) against long COVID in children aged 5 to 17 years. METHODS: This retrospective cohort study used data from 17 health systems in the RECOVER PCORnet electronic health record program for visits after vaccine availability. We examined both probable (symptom-based) and diagnosed long COVID after vaccination. RESULTS: The vaccination rate was 67% in the cohort of 1 037 936 children. The incidence of probable long COVID was 4.5% among patients with COVID-19, whereas diagnosed long COVID was 0.8%. Adjusted vaccine effectiveness within 12 months was 35.4% (95 CI 24.5–44.7) against probable long COVID and 41.7% (15.0–60.0) against diagnosed long COVID. VE was higher for adolescents (50.3% [36.6–61.0]) than children aged 5 to 11 (23.8% [4.9–39.0]). VE was higher at 6 months (61.4% [51.0–69.6]) but decreased to 10.6% (−26.8% to 37.0%) at 18-months. CONCLUSIONS: This large retrospective study shows moderate protective effect of severe acute respiratory coronavirus 2 vaccination against long COVID. The effect is stronger in adolescents, who have higher risk of long COVID, and wanes over time. Understanding VE mechanism against long COVID requires more study, including electronic health record sources and prospective data.
Original language | English (US) |
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Article number | e2023064446 |
Journal | Pediatrics |
Volume | 153 |
Issue number | 4 |
DOIs | |
State | Published - Apr 1 2024 |
Funding
FUNDING: This research was funded by the National Institutes of Health Agreement OT2HL161847-01 as part of the Researching COVID to Enhance Recovery (RECOVER) program of research. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the National Institutes of Health.
ASJC Scopus subject areas
- Pediatrics, Perinatology, and Child Health