"The rash of infections highlights just how contagious the delta variant is, underscoring “the importance of vaccinating school staff members who are in close indoor contact with children ineligible for vaccination as schools reopen,” the CDC report said."
Delta is different for kids and I'm not sure that message is getting out.
sfchronicle.com
See Also: A CDC-funded simulation projects that without masking or testing, more than 75 percent of children could be infected within three months.