Since Coronavirus disease 2019 (COVID-19) was spread in the world, we have been compelled to do infection controls such as putting a mask on, washing hands, avoiding contact to other people, and so on. However, it is difficult to know how effective the infection controls are. Therefore, the purpose of this study is to provide the information about the evaluation of the infection controls based on infection risk. In this study, infection risk was calculated semi-quantitatively. As a result, it is numerically shown that air-mediated routes such as droplets and aerosols are important for the infection. And also, it is effective to put a mask on, take social distancing, and ventilate as infection controls. If people could understand what infection controls are effective on the infection risk, the people would continue the infection controls in order to control COVID-19.
