Endemic disease is defined as -
Ans. is 'a' i.e., Disease occuring regularly in expected frequency Sporadic - Disease occuring irregularly from time to time.Endemic - Disease occuring regularly in expected frequency.Epidemic - Disease occuring in excess of expected frequency.Pandemic - Epidemic affecting a large proportion of population over a wide geographic area.
Disease occuring regularly in expected frequency
Disease occuring irregularly
Disease occuring in excess of expected freqency
Disease affecting a large population
Infectious Disease Epidemiology