 cstes update to the standardized surveillance case definition and national notification for 2019 novel coronavirus disease covid 19 this position statement updates the standardized case definition for 2019 novel coronavirus disease covid 19 including asymptomatic infections caused by severe acute respiratory syndrome coronavirus 2 sars cov 2 and retains covid 19 as a nationally notifiable condition updates clarify clinical laboratory epidemiologic linkage and vital records criteria for case ascertainment and case classification based on the continued evolution of the covid 19 pandemic updates probable case classifications and adds suspect case classifications 