Endemic Disease' means that a disease -
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 and/or 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
Occurs clearly in excess of normal expectancy
Is constantly present in a given population group
Exhibits seasonal pattern
Is prevalent among animals