Clinical characteristics
illness
PROGRESSION
As expected, the number of children in the observational cohort with more severe clinical features (Baseline characteristics of observational participants and combined dataset






Progression of illness was recorded for 705 of 744 participants (94.8%). A total of 29 (4.1%) children in the cohort had illness progression requiring attendance or admission to hospital (for details of the illnesses, see Supplementary Box S1).