This paper proposed a mathematical model for COVID-19. The reproduction number of the model is
established for transmission and determined that the model has two positive equilibrium points. The disease -free
equilibrium is locally asymptotically stable whenever the reproduction number is less than unity. When the basic
reproduction number is greater than unity, the model has a unique endemic equilibrium,which is locally asymptotically
stable. The sensitivity analysis of the model was considered. It shown that the contact rate and incubation rate are
major factors in epidemic situation, as increasing those values results in increasing in the reproduction number.
Additionally, numerical simulations compared the predicted model and actual data in Thailand during2021 – 2022. It
is suggested that the trend of the predicted model and the actual data are in the same direction.