Yeah: For the majority of the pandemic only 4% of asymptomatic SARS-CoV-2 PCR-positive patients were shown to be infectious. (During the Omicron wave, the percentage peaked at about 25%.)

Also, this:

“The probability of a kid in class who is not sick actually being infectious is very low,” Dr Ralph Tayyar said. Think about it this way: even if every single student in a school without symptoms was infected, 96 percent of them still weren’t capable of transmitting to others. Yet, of course, most people without symptoms are not infected. Moreover, just because 4 percent were technically capable of infecting others does not mean that in actuality they had sufficient amount of replicating virus to do so. We are talking about a subgroup of a subgroup of a subgroup.