In control of communicable diseases, the period of quarantime in respect of a disease is determined by-
Incubation period
Infectivity period
Duration of illness
Carrier state
.quarantine has been defined as the limitation of freedom of movement of such well persons or domestic animals exposed to communicable disease for a period of time not longer than the longest usual incubation period of the disease, in such a manner as to prevent effective contact with those not so exposed,so its communicability can be attributed to the incubation period. ref:park&;s textbook,22nd edition,pg no 112
Epidemiology