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Symptoms of COVID-19 in each age group during the omicron and pre-omicron eras. A, 0–4 years of age (n = 65 in the pre-omicron era and n = 54 in the omicron era). B, 5–11 years of age (n = 23 in the pre-omicron era and n = 53 in the omicron era). C, 12–17 years of age (n = 18 in the pre-omicron era and n = 6 in the omicron era).
