In China, estimates for the death-to-case ratio decreased from 17.3% (for those with symptom onset 1–10 January 2020) to 0.7% (for those with symptom onset after 1 February 2020).Other measures include the case fatality rate (CFR), which reflects the percent of diagnosed people who die from a disease, and the infection fatality rate (IFR), which reflects the percent of infected (diagnosed and undiagnosed) who die from a disease.