title: The prevalence of previously undiagnosed leprosy in the general population of northwest bangladesh.
abstract: BACKGROUND
  The prevalence of previously undiagnosed leprosy (PPUL) in the general population was determined to estimate the background level of leprosy in the population and to compare this with registered prevalence and the known PPUL in different levels of contacts of leprosy patients.
  
  
  RESULTS
  Multistage cluster sampling including 20 clusters of 1,000 persons each in two districts with over 4 million population. Physical examination was performed on all individuals. The number of newly found leprosy cases among 17,862 people above 5 years of age from the cluster sample was 27 (19 SLPB, 8 PB2-5), giving a PPUL rate of 15.1 per 10,000.
  
  
  CONCLUSIONS
  PPUL in the general population is six times higher than the registered prevalence, but three times lower than that in the most distant subgroup of contacts (neighbour of neighbour and social contacts) of leprosy patients in the same area. Full village or neighbourhood surveys may be preferable to contact surveys where leprosy is highly endemic.
authors.affiliation: Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
authors.forename: Fake J
authors.initials: FJ
authors.lastname: Moet
authors.forename: Ron P
authors.initials: RP
authors.lastname: Schuring
authors.forename: David
authors.initials: D
authors.lastname: Pahan
authors.forename: Linda
authors.initials: L
authors.lastname: Oskam
authors.forename: Jan Hendrik
authors.initials: JH
authors.lastname: Richardus
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D001459:Bangladesh / Q000453:epidemiology; D002648:Child; D006801:Humans; D007918:Leprosy / Q000453:epidemiology*; D015995:Prevalence; D012307:Risk Factors; D055815:Young Adult