<prompt> Under the National Leprosy Elimination Programme, mass survey for leprosy is done if prevalence of leprosy is more than:1100051000101000201000  <response>: Under the NLEP, mass surveys are carried out by house to house surveys if prevalence of leprosy is101000. In mass surveys, not less than 95 of the population should be covered. Ref: Park 21st edition, page 295. 