“…Such conditions attract large fly populations and, hence, a readily available vector for disease transmission. The incidence of trachoma is known to diminish particularly when community hygiene improves (Hardy et al, 1967). Innorthwestern and central areas of the continent more than 50% of Aboriginal people suffer from one or other form of the disease; and in specific communities, such as those in the Warburton Ranges in Central Australia and Musgrave Park and Coober Pedy in South Australia, overall population frequencies of 77%, 96%, and 74% have been recorded, respectively (Mann, 1957;Moodie, 1973).…”