Spread in US schools

USA, Teacher learned she was positive 2 days later https://www.washingtonpost.com/health/2021/08/28/delta-variant-unvaccinated-children-elementary-schools/ Marin County, California, May 19, under 12s One teacher, not vaccinated, feeling fatigued with some nasal congestion Worked on, toot of mask for class reading Air filter, windows open on two walls 6 feet between desks Learned she was positive two days later 12 of 24 had been infected 6 symptomatic, 6 asymptomatic Mostly in the two rows closest to her desk Outbreak spread to other classes Siblings and parents, including some who were fully vaccinated Tracy Lam-Hine, epidemiologist for the county everyone lets their guard down — but the thing is delta takes advantage of slippage from any kind of protective measures Children under 12, ineligible for vaccines COVID-19 Projections for K12 Schools in Fall 2021: Significant Transmission without Interventions https://www.medrxiv.org/content/10.1101/2021.08.10.21261726v1 Without testing and masking R0 = 4.0 More than 75% of susceptible students get infected within three months in all settings With masks, R0 = 2.0 The proportion infected drops to approximately 50% Testing further drops infections High, 22% Mid, 16% Low, 13% Conclusion Without interventions in place, the vast majority of susceptible students will become infected through the semester. Universal masking can reduce student infections by 26-78%, and biweekly testing along with masking reduces infections by another 50%. To prevent new infections in the community, limit school absences, and maintain in-person learning, interventions such as masking and testing must be implemented widely, especially among elementary school settings in which children are not yet eligible for the vaccine. Canada https://www.canada.ca/en/public-health/services/diseases/2019-novel-coronavirus-infection.html NZ https://www.health.govt.nz/our-work/diseases-and-conditions/covid-19-novel-coronavirus/covid-19-data-and-statistics/covid-19-current-cases Australia https://www.health.gov.au/news/health-alerts/novel-coronavirus-2019-ncov-health-alert/coronavirus-covid-19-case-numbers-and-statistics UK data https://coronavirus.data.gov.uk Learn more about your ad choices. Visit megaphone.fm/adchoices