School transmission varies according to student age and local incidence and is substantially reduced with mitigation measures. Nevertheless, when transmission occurs, it may be difficult to detect without regular testing because of the subclinical nature of most children's infections. Teacher vaccination can reduce transmission to staff, and asymptomatic screening improves understanding of local circumstances and reduces transmission. Uncertainty exists about the susceptibility and infectiousness of children, and precision is low regarding the effectiveness of specific, particularly with new variants. ACP explains.
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