摘要： An investigation of human Demodex infestation in 4,800 persons was carried outfrom 1979 to 1982, among them 860 (17.9%) were infested. In this infested population,males outnumbered females, and 82. 3% of the patients were infested with D. folliculo-rum, 8. 1% with D. brevis, and 9. 5% with both species. The morbidity of the Demodex