Density of COVID‑19 and mass population movement during long holiday: Simulation comparing between using holiday postponement and no holiday postponement

Letter to editor: covid‑19 is a big pandemic at present and accepted as an emergency problem internationally. several preventive measurements against covid‑19 have been used.[1,2] control of population movement is a basic principle. the control of intercountry population movement is usually by border closure. for intracountry control, school/office closure is generally used. another interest method is holiday postponement aiming at blocking of mass population movement from capital to rural areas within the country. the effect of holiday postponement has to be carefully considered since it can affect the epidemic characteristics in both capital and rural areas.