A study published in The Lancet Child & Adolescent Health stated that kids were less prone to COVID-19 re-infection risks and the severity of disease was much less if re-infected.

The study included national SARS-CoV-2 testing data from the Alpha (B.1.1.7) and Delta (B.1.617.2) variant waves in England. Overall, 688 418 primary infections and 2343 re-infections were identified among children aged 16 years and below. 

It was observed that the adults were re-infected more (72•53 per 100 000) compared to the children (21•53 per 100 000). The overall re-infection rate after primary infection was 0•68%, with 0•73% in adults compared with 0•18% in children below 5 years, 0•24% in those aged 5–11 years, and 0•49% in those aged 12–16 years. A total of 78 (72%) out of 109 childrenadmitted to the hospital had an underlying comorbid condition.ICU admissions were rare and 44 deaths within 28 days after primary infection (0•01%) were reported, with no fatality after re-infection.

Further, it was noted that the rate of infection was maximum among unvaccinated adults (aged 20-29 years). Most of the re-infections among children were asymptomatic compared to the primary infection (49.1% vs 37.0%, P<0.0001). MedPage Today, March 29, 2022; Lancet Child Adolesc Health 2022; DOI:https://doi.org/10.1016/S2352-4642(22)00059-1