The coronavirus disease 2019 (COVID-19) pandemic is the most disruptive health event in a century. In less than a year, it will have killed at least 1.5 million people and cost the global economy more than $20 trillion. Although progress toward a vaccine has been fast, core public health interventions remain the mainstay of control and will continue to be essential after vaccines become available. Strategic closure of risky indoor environments, such as bars, restaurants, and choirs, reduces spread. Testing, rapid isolation, contact tracing, and quarantine prevent cases and clusters from spreading. Use of face masks has emerged as a powerful tool to reduce the health and economic harms of the pandemic (1).

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