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As of 2020, COVID-19 is spreading in the world. In Japan, the Ministry ofHealth, Labor and Welfare developed COVID-19 Contact-Confirming Application(COCOA). The researches to examine the effect of COCOA are still notsufficient. We develop a mathematical model to examine the effect of COCOA andshow examined result.

A Calculation Model for Estimating Effect of COVID-19 Contact-Confirming Application (COCOA) on Decreasing Infectors