Urine samples were collected from 248 men, 21 of whom were known contacts of women infected with Trichomonas vaginalis. This organism was cultured from only three of the 21 specimens from patients in the contact group. The cultural technique was shown to be capable of reliably detecting small numbers of organisms under practical conditions; it appears, therefore, that most male contacts shed relatively few trichomonads and that the infective dose for women must be correspondingly small.
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