Since 1968, annual door-to-door examinations of approximately 500 San Xavier Papago Indians have been done in order to determine the incidence of trachoma. Special attention has been given to analysis of environmental-sanitation variables, demographic patterns, educational level, and tribal social psychology. After four years there has been a significant reduction in adult but not childhood trachoma. Unfortunately, many of the epidemologic factors studied have not appeared to be contributory to the transmission or cure of trachoma on this reservation. On the other hand, the possibility of some degree of Indian apathy toward their disease and a negative effect on its elimination has been raised.
Portney GL, Portney SB. Epidemiology of Trachoma in the San Xavier Papago Indians. Arch Ophthalmol. 1971;86(3):260-262. doi:10.1001/archopht.1971.01000010262004