学校の換気、そして先生たちのマスク着用義務

 

学校でのマスク着用義務付けに意味なし　https://t.co/J3VG5O09BS　CDCの発表：ジョージア州169校9万人の小学生を対象にした調査，昨年11-12月にてマスク着用を義務化した学校vs任意とした学校で，感染発生率に統計的に有意な差がなかった。

— Spica (@Kelangdbn) September 7, 2021

記事が引用している論文をみるとちょっと含意がちがうかんじも・・・。 

Mask Use and Ventilation Improvements to Reduce COVID-19 Incidence in Elementary Schools — Georgia, November 16–December 11, 2020 Weekly / May 28, 2021 / 70(21);779–784

CDC recommends implementing multiple prevention strategies (2) (e.g., physical distancing, masking, improved ventilation, and contact tracing) that have been associated with lower SARS-CoV-2 transmission in kindergarten through grade 12 settings (3–5). Since the completion of this study, COVID-19 vaccines have become widely available, and CDC recommends vaccination for teachers, staff members, and students aged ≥12 years (2). Until vaccines are available for children aged <12 years, universal and correct mask use is a critical prevention strategy CDC recommends that schools prioritize regardless of vaccination status for in-person learning (2). In the current study, the lower incidence in schools requiring mask use among teachers and staff members is consistent with research on mask effectiveness (6), and investigations that have identified school staff members as important contributors to school-based SARS-CoV-2 transmission (7). The 21% lower incidence in schools that required mask use among students was not statistically significant compared with schools where mask use was optional. This finding might be attributed to higher effectiveness of masks among adults, who are at higher risk for SARS-CoV-2 infection but might also result from differences in mask-wearing behavior among students in schools with optional requirements. Mask use requirements were limited in this sample; 65.1% of schools required teacher and staff member mask use and approximately one half (51.5%) required student mask use. Because universal and correct use of masks can reduce SARS-CoV-2 transmission (6) and is a relatively low-cost and easily implemented strategy, findings in this report suggest universal and correct mask use is an important COVID-19 prevention strategy in schools as part of a multicomponent approach.

換気が大事なんだけど、学校の先生たちにマスクを義務付けたら、感染拡大は有意に減少した、という話みたいね。

学校での子どもたちのマスク義務の有無ではたしかに有意の差はなかったんだけど、それは学校の大人たちがマスクをしていたらからそれが有効だったのかもしれいないし、また、子どもたちは義務はなくてもマスクしてたりしたせいかもしれない、みたいな。

結論としてはとにかく、

What are the implications for public health practice?

Mask requirements for teachers and staff members and improved ventilation are important strategies in addition to vaccination of teachers and staff members that elementary schools could implement as part of a multicomponent approach to provide safer, in-person learning environments.

学校の換気、ワクチン接種の有無に関わらず、先生たちのマスク着用義務が有効だ、と。