<prompt> According to WHO, the prevalence of leprosy is a major public health problem when the incidence is more than:0.100.500.011  <response>: 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. 0.01Thus leprosy will be a public health problem if its incidence is more than 0.01.I admit, I havent 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 11000 or higherMass survey: areas where prevalence is about 10 or more per 1000population. 