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With better understanding of its transmission characteristics, practical nonpharmaceutical preventive measures remain essential to reduce SARS-CoV-2 transmission and its associated health and socioeconomic burdens. Because well tolerated and effective vaccines for SARS-CoV-2 are unlikely to be widely available in the near future, there is an urgent need for finding other measures to reduce the spread of the COVID-19 pandemic. With better understanding of its transmission characteristics, practical nonpharmaceutical preventive measures re