COVID-19(6) SARS-CoV-2(3) Influenza(2) Transmission.(2) K-12 schools(2) testing.(2) Pandemic flu(1) caregiver preference(1) primary and secondary schools(1) secondary transmission(1) Screening(1) racism(1) child health(1) Non-pharmaceutical interventions(1) vaccination.(1) school-based testing.(1) Surveillance(1) Infectious disease control(1) online learning(1) influenza outbreaks(1) school closure policy.(1) Rapid antigen tests(1) athletics(1) stigma and discrimination(1) influenza vaccine(1) Michigan(1) virtual learning.(1) emergency preparedness(1) laboratory screening(1) sports.(1)