OBJECTIVES Masking is an essential coronavirus 2019 mitigation tool assisting in the safe return of kindergarten through 12th grade children and staff to in-person instruction; however, masking adherence, compliance evaluation methods, and potential consequences of surveillance are currently unknown. We describe 2 school districts' approaches to promote in-school masking and the consequent impact on severe acute respiratory syndrome coronavirus 2 secondary transmission. METHODS Two North Carolina school districts developed surveillance programs with daily versus weekly interventions to monitor in-school masking adherence. Safety teams recorded the proportion of students and staff appropriately wearing masks and provided real-time education after observation of improper masking. Primary infections, within-school transmission, and county-level severe acute respiratory syndrome coronavirus 2 infection rates were assessed. RESULTS Proper mask use was high in both intervention groups and districts. There were variations by grade level, with lower rates in elementary schools, and proper adherence being higher in the weekly surveillance group. Rates of secondary transmission were low in both districts with surveillance programs, regardless of intervention frequency. CONCLUSIONS Masking surveillance interventions are effective at ensuring appropriate masking at all school levels. Creating a culture of safety within schools led by local leadership is important and a feasible opportunity for school districts with return to in-person school. In our study of schools with high masking adherence, secondary transmission was low.

中文翻译：

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K-12 学校中的掩盖依从性和 SARS-CoV-2 二次传播。

目标 口罩是 2019 年冠状病毒的重要缓解工具，有助于幼儿园至 12 年级的儿童和工作人员安全返回现场教学；然而，掩盖依从性、依从性评估方法和监测的潜在后果目前尚不清楚。我们描述了两个学区促进校内佩戴口罩的方法以及对严重急性呼吸综合征冠状病毒 2 二次传播的影响。方法 北卡罗来纳州的两个学区制定了监测计划，采用每日与每周干预措施来监测校内佩戴口罩的遵守情况。安全团队记录了学生和工作人员正确佩戴口罩的比例，并在观察到不当佩戴口罩后进行实时教育。对原发感染、校内传播和县级严重急性呼吸综合征冠状病毒 2 感染率进行了评估。结果 干预组和地区正确佩戴口罩的比例都很高。不同年级存在差异，小学的比例较低，而每周监测组的正确遵守率较高。无论干预频率如何，两个实施监测计划的地区的二次传播率都很低。结论 掩蔽监测干预措施可有效确保各级学校适当掩蔽。在当地领导层领导下的学校内营造安全文化非常重要，对于学区重返校园来说也是一个可行的机会。在我们对戴口罩依从性高的学校的研究中，二次传播率较低。