The return to school after winter break can sometimes lead to an influx of COVID-19 cases, seasonal influenza (flu), and other infectious diseases. K-12 schools can implement core prevention strategies to help prevent and mitigate the spread of these illnesses and support safe and healthy environments this winter and year round. Reference SchoolSafety.gov’s infographic for specific information and resources on hand hygiene, cleaning and disinfecting, and ventilation and indoor air quality, along with general guidance for school administrators.