Is having the virus without symptoms really a case? The Coronavirus act says so. However, there's only tenuous evidence of asymptomatic and presymptiomatic transmission of the virus.
Kids tested with no symptoms had the same viral load in their nasal cavities as symptomatic cases so there's little reason to believe they were less effective spreaders than a person showing symptoms.
https://www.uchealth.org/today/the-truth-about-asymptomatic-...