EN
The course of S. papillosus infection in lambs born by ewes affected with this disease was estimated on the basis of the presence of parasitic eggs in faeces. The examinations were started 2 weeks prior to the expected parturition and were continued in lambs and their mothers at 2-week intervals until the lambs were 100 days old. It was demonstrated that 60% or the lambs had been infected with S. papillosus by the third week of their life. In their mothers, increased infection extensity was found at the perinatal period.