This is the collection of evidence that CDPH cites for the foundation of the ridiculous guidelines update for schools.

https://www.cdph.ca.gov/Programs/CID/DCDC/Pages/COVID-19/Safe-Schools-for-All-Plan-Science.aspx#.YASkC39jCGQ.twitter
the evidence suggests that children seem to get COVID-19 less frequently than adults
Children with COVID-19 Most Often Get It from a Household Contact. For instance, a study of 10 early childhood centers and 15 schools (>6000 people) found low rates in the schools overall (1.2%) and >90% of cases were from the community, not from in-school transmission.
Transmission Among or from Students Is Uncommon....going to schools was not associated with having a positive COVID-19 test, but that social gatherings were—including weddings, parties, and playdates.
Child-to-adult transmission occurred only 1% of the time. In contrast, adult-to-child transmission occurred 1.5% of the time, and adult-to-adult transmission was 4.4%, almost 15 times higher than child-to-child transmission.
Low Risk of Transmission in Elementary Schools. The elementary school study included six schools and >500 students, with only 9% of students, 7% of teachers, and 4% of non-teaching adults with antibodies, very similar to community prevalence.
Testing Students and Staff with Symptoms Can Prevent Outbreaks. Key words "with Symptoms".
Core Mitigation Strategies. They found that masks alone and stable cohorts alone were more effective than even weekly testing of students and teachers.
Nothing in this summary or the studies suggest applying the ridiculous guidelines that basically removes the ability for local decisions.
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