Abstract:

Objective: To investigate the infective status and reasons of Demodex in middle school students at Longmen Township of
Yongping County in Dali Prefecture. Methods: Facial infection of Demodex of 211 middle school students were examined by
cellophane tape method and the facial skin condition were also recorded. Results: The infection rate of Demodex was 6.16% in
middle school student. The infection rate of male (7.34%) was higher than that of female (4.9%). The infection rate of Demodex
folliculorum was higher than that of Demodex brevis (χ²=7.538, P<0.05). There were significant differences on the infection rates of
the students washing with water, soap, cleanser and medicated soap. (χ²=1.526, P<0.05). and there was significant difference on
infective rate of students living in school or at home (χ²=10.972, P<0.05). The infection rate of Demodex at frontal was higher than the
rates of other parts and the infection rate of students who were oily skin was higher than that of students who were normal skin or dry
skin (χ²=1.314, P<0.05). Conclusion: The infection of Demodex could be found on the middle school students at Longmen Town,
which raised that strategy should be conducted to strengthen students facial Demodex prevention.

Key words: demodex, middle school students, infection rate