<prompt> Endemic Disease means that a disease -Occurs clearly in excess of normal expectancyIs constantly present in a given population groupExhibits seasonal patternIs prevalent among animals  <response>: Ans. is b i.e., Is Consistantly present in a given population group Endemic disease o It refers to constant presence of a disease or infectious agent within a given geographic area or population group, without impoation from outsite.o In other words Endemicity is defined as the usual or expected frequency of the disease within a given geographic area or population group.What does expected frequency usual frequency meano Expected frequency -- The number range of cases of a disease that one would expect to occur in a given popuation group if population and environmental conditions are stable.o Expected frequency normal expectancy is derived by looking at average of number of cases of the disease in previous 3 -- 5 years in that geographical area.Other terms related to endemic disease : -i Hyperendemic -p The disease is constantly present at a high incidence andor prevalence rate and effects all age group equally.ii Haloendemic -- A high level of infection begining early in life and affecting most of the child population, leading to a state of equilibrium such that adult population shows evidence of disease much less commonly than to the children, as in case of malaria 