Table 3. Investigation of human cystic echinococcosis surgical cases determined by questionnaire in Yuanhuchun Community and Ershilidian Community, Hutubi County, Xinjiang, China.

Duration	Cases
1966–1970	3
1971–1975	3
1976–1980	3
1981–1985	13
1986–1987	15
Total	37

All cases were confirmed by a follow-up visit by the investigating team. In 1987, the two communities had 25,684 inhabitants.