key: cord-347248-6scdvu1d
authors: Ge, Yang; Sun, Shengzhi
title: Estimation of Coronavirus Disease Case-Fatality Risk in Real Time
date: 2020-08-17
journal: Emerg Infect Dis
DOI: 10.3201/eid2608.201096
sha: 
doc_id: 347248
cord_uid: 6scdvu1d

We ran a simulation comparing 3 methods to calculate case-fatality risk for coronavirus disease using parameters described in previous studies. Case-fatality risk calculated from these methods all are biased at the early stage of the epidemic. When comparing real-time case-fatality risk, the current trajectory of the epidemic should be considered.

Yang Ge, Shengzhi Sun (1) . In their analyses, the authors estimated the case-fatality risk adjusted to a fixed lag time to death. They acknowledged that the calculated adjusted case-fatality risk (aCFR) might be influenced by residual uncertainties from undiagnosed mild COVID-19 cases and a shortage of medical resources. However, we believe the time-varying number of cumulative cases and deaths also should be considered in the epidemic profile.

Because of the exponential growth curve of the COVID-19 outbreak, the numbers of cumulative cases and cumulative deaths have been relatively close to each other in the early stages of the outbreak, leading to a much higher aCFR. As the outbreak progresses, the ratio of the cumulative cases and deaths declines, which reduces the aCFR. Thus, a higher aCFR does not necessarily indicate increased disease severity.

To test our hypothesis, we performed a simulation study by using a susceptible-infectious-recovered-death model and parameters set according to prior studies. We set the infectious period as 10 days (2); case-fatality risk as 3% (3); basic reproductive ratio (R 0 ) as 2.5 (4); recovery rate as 1/13 day (5) , that is, 13 days from illness onset to recovery; and the population size as 1 million. We compared crude casefatality risk, aCFR per Wilson et al.'s method, and aCFR per Mizumoto et al.'s method (6) . Although the case-fatality risk calculated from these methods all are biased at the early stage of the epidemic, case-We ran a simulation comparing 3 methods to calculate case-fatality risk for coronavirus disease using parameters described in previous studies. Case-fatality risk calculated from these methods all are biased at the early stage of the epidemic. When comparing real-time casefatality risk, the current trajectory of the epidemic should be considered.

Progression of coronavirus disease outbreak and changes in the case-fatality risk by crude and adjusted rates. Crude case-fatality risk is the cumulative number of deaths on a given day divided by the cumulative number of cases on the same day. We set the infectious period as 10 days (2); case-fatality risk as 3% (3); basic reproductive ratio (R 0 ) as 2.5 (4); recovery rate as 1/13 day (5) , that is, 13 days from illness onset to recovery; and the population size Figure) .

In conclusion, we recommend the Mizumoto et al. method (6) to calculate aCFR in real time. When comparing real-time estimation of the case-fatality risk across countries and regions, our results indicate that the current trajectory of the epidemic should be considered, particularly if the epidemic is still in its early growth phase.

Mr. Ge is a PhD candidate in the Department of Epidemiology and Biostatistics at the University of Georgia, Athens, Georgia, USA. His research interests include infectious disease modeling and vaccine design.

Dr. Sun is a research scientist at the Boston University School of Public Health. His research focuses on estimating the impact of air pollution and climate change on human health.

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