1 is the separation from other persons of an individual suffering from a communicable disease. 2 is the limitation of freedom of movement of persons or animals which have been exposed to communicable disease for a period of time equivalent to the longest incubation period of illness. 3 is the act of watching. 4 are diseases that occur occasionally and irregularly with no specific pattern. 5 are diseases that occur in a greater number than what is expected in a specific area over a specific time. 6 is an epidemic that affects several countries or continents