Toxoplasmin sensitivity: subnormality and environment.
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000453:epidemiology*; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000453:epidemiology*; D008875:Middle Aged; D012189:Retrospective Studies; D012882:Skin Tests; D014125:Toxoplasmosis, Congenital / Q000453:epidemiology*; D006113:United Kingdom