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Official websites use. Share sensitive information only on official, secure websites. Corresponding author tom. Children are underrepresented in the COVID pandemic and often experience milder disease than adolescents and adults.
Reduced severity is possibly due to recent and more frequent seasonal human coronaviruses HCoV infections. In this cross-sectional seroprevalence study, serum samples were collected from children and adults requiring hospital admission for non-COVID between February and August Antibody levels to seasonal HCoV increased substantially up to the age of Our search showed 57 publications.
Cross-reactivity in pre-pandemic samples between SARS-CoV-2 and seasonal coronaviruses is generally low and antigen-dependent. Higher degree of cross-reactivity was observed with subunit S2 of Spike, which was found to be neutralising in one study.
However, most of the studies looked at antibody responses with a relatively small sample size or limited the measurement to adults. Our study provides a detailed characterization of humoral immunity to SARS-CoV-2 and seasonal coronaviruses in a study population comprising a wide age spectrum including one of the largest collection of samples from children assembled to date.
We measured antibodies to different antigens with two assays and a pseudotype neutralisation assay. We found that the immune response to SARS-CoV-2 is lower in adolescents and young adults compared to young children and older adults. We found clear evidence for serological cross-reactivity, most notably for the betacoronavirus OC A previous seasonal coronavirus infection seems limited to cross-reactivity in assays rather than cross-protection from a SARS-CoV-2 infection.