This field guide has been revised for Summer 2021 camps. It includes 14 sections on basics on screening and preventing COVID-19 and a new section on vaccines. It has revised information on testing and non pharmaceutical interventions (NPI) that will still be critical in 2021 given the rate of COVID-19 and the risks from highly contagious variants. There are support videos on key topics like screening for day and overnight camps, cohorts, and NPIs. This resource supports the COVID-19 response.