title: Active search operations for smallpox--an Ethiopian experience.
mesh_terms: D000328:Adult; D002648:Child; D002675:Child, Preschool; D005002:Ethiopia; D005260:Female; D006801:Humans; D012621:Seasons; D012899:Smallpox / Q000453:epidemiology* / Q000517:prevention & control; D014611:Vaccination