A simple statistical physics model for the epidemic with incubation period

Based on the classical SIR model, we derive a simple modification for dynamics of epidemics with known incubation period infection. The model is described by system integro-differential equations. Parameters our directly related to epidemiological data. We some analytical results, as well perform numerical simulations. use proposed analyze COVID-19 epidemic data in Armenia. propose strategy: organize quarantine, and then conduct extensive testing risk groups during evaluating percentage population among people symptoms.