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Antibodies (%) against the SARS-CoV-2 spike protein (detectable after vaccination and/or infection) and nucleocapsid protein (only after infection) in 275 children aged 2–6 years attending day-care centers (data on two children missing). Age-dependent statistically significant increase in seroprevalence for the spike protein (Kendall Tau-b 0.16; p = 0.001), non-significant increase for the nucleocapsid protein (Kendall Tau-b 0.07; p = 0.206)
