The rapid spread of disease to a large number of people in a given population within a short time is defined as an epidemic. Epidemics of infectious disease are generally caused by several factors, including a change in the ecology of the host population.
The main symptoms of coronavirus (COVID-19) are a high temperature, a new, continuous cough and a loss or change to your sense of smell or taste. To help stop the spread of coronavirus, avoid close contact with anyone you do not live with and wash your hands regularly. You can usually treat mild COVID-19 symptoms at home.