The study, released Tuesday, was based upon 17 rural Wisconsin schools, grades K-12, from Aug. 31-Nov. 29.
During the survey period, teachers reported more than 92% of students wore masks, groups of students were limited to 11-20, staff kept a distance of at least 6 feet when possible, and staff and students quarantined immediately after exposure.
During the 13 weeks, only 7 school-attributed COVID cases of the 4,876 students – and none of the 654 staff – were attributed to COVID.
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Some teachers unions have been fighting a return to in-person learning until teachers can be vaccinated, The Washington Examiner reported.
However, a second CDC study warns against sports events, arguing that they could potentially pose a high risk.
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The study focused on two high school wrestling events in Florida in December, noting among the 130 wrestlers, coaches, and referees present, 38 later tested positive for COVID-19.
And 41 others who came into close contact with those 38 also tested positive.
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"High-contact school athletic activities for which mask wearing and physical distancing are not possible should be postponed during periods with substantial or high levels of SARS-CoV-2 community transmission," the study noted.
White House Chief of Staff Ron Klain defended teachers' unions who refuse to resume in-person teaching despite these studies which have shown a low risk of spreading the coronavirus.
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Klain was asked Tuesday night why he believed so many public schools were still closed despite studies backed by the Centers for Disease Control and Prevention (CDC) that continued to show it is safe for K-12 schools to reopen.
"I'll give you a word: money," Klain responded during a CNN interview. "That's why the president of the United States sent a plan to Congress even before he took office to make the investments you need to make the schools safe."
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CNN anchor Erin Burnett pushed back, claiming transmission of the virus was "just not happening."
She then pointed to the Chicago Teachers Union, which recently voted to extend virtual learning.
"Ron, why do you think that the teachers unions in many cases are overruling what the studies show?" Burnett asked.
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"I don't think that teachers' unions are overruling studies," Klain said. "I think that what you're seeing is that schools haven't made the investments to keep the students safe. I mean, again, the Wisconsin study was classrooms of 12 on average. So that requires a lot more classrooms, a lot more teachers, or, you know, other kinds of arrangements to get them small, podding students very carefully."
"So we need to do things to open safely. Most of the teachers I talk to, they want to be back in the classroom. They just want to know that it's safe and we as a country should make the investments to make it safe," Klain concluded.
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