Under the National Leprosy Elimination Programme, mass survey for leprosy is done if prevalence of leprosy is more than:
Under the NLEP, mass surveys are carried out by house to house surveys if prevalence of leprosy is>10/1000. In mass surveys, not less than 95% of the population should be covered. Ref: Park 21st edition, page 295.
1/1000
5/1000
10/1000
20/1000