Outbreak in California classroom underscores Delta variant risks

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As the Education Ministry postpones the resumption of face-to-face lessons at schools, a Covid-19 outbreak at a California classroom may offer some lessons on what risks might lie ahead.According to a case study published last week, the outbreak is centred at an elementary classroom in Marin County in California, USA, where the outbreak’s index case conducted lessons as the teacher.The teacher infected half the class of 24 children - who were too young to be vaccinated - and the cluster grew to infect at least 27 people, from May 23 to June 12. Researchers found the school took several precautions against Covid-19 by leaving doors and windows open, separating all desks six feet (1.82m) apart, and placed portable high-efficiency particulate air filters (Hepa) in each classroom.Interviews with the students’ parents also suggested that the students strictly complied with the maski…