Epidemiologic Observations on Trachoma in the United States.

In the United States, as in most areas of the world, trachoma is a disease of the family. Infection open takes place in early life as a result of close contact between mother or grandmother and child, or between preschool siblings. No true carrier state has been demonstrated in trachoma but the frequency of minimal disease subject to periodic exacerbation is believed to be an important factor in its epidemiology.