This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Leprosy, Subject name: Social & Preventive Medicine
According to WHO, the prevalence of leprosy is a major public health problem when the incidence is more than: 
Select and explain. 
A. 0.10%, B. 0.50%, C. 0.01%, D. 1%
C: 0.01%
Answer: C: 0.01% 
Explanation: Ans is 'c' i.e. 0.01% Under the NLEP the goal is to reduce case load to 1 or less than I per 10000 population (i.e. 0.01)Thus leprosy will be a public health problem if its incidence is more than 0.01%.I admit, I haven't found the answer, written in any text but this is the inference I have drawn from Park.Case finding methods in leprosy control ProgrammeContact surveys* are done where the prevalence of leprosy is < 1 case per 1000populationGroup survey* : where prevalence is 1/1000 or higherMass survey*: areas where prevalence is about 10 or more per 1000population.