Abstract: Objective To investigate the Demodex infection status and influencing factors in medical students in Wuhu City. Methods The mite specimens were collected by the cellophane tape method， and the influencing factors were investigated through the questionnaires. Results A total of 316 medical students were surveyed， 117 students were infected with Demodex mite， and the total infection rate was 37.03%. There was no significant difference between the male and female in the infection rate （[χ2]= 0.00， P > 0.05）. Of the 117 infected cases， the infection rate of simple Demodex folliculorum was 51.28%， the infection rate of simple Demodex brevis was 24.79%， and the rate of mixed infections was 23.93%. The rate of the mild infection （83.76%） was significantly higher than that of the moderate infection （12.82 %） and that of the severe infection （3.42%）. The infection rate in the forehead was the highest （29.41%）. Among the students with the oily skin， the infection rate of Demodex mite was related to sex. The infection rate of simple Demodex brevis in the male （3.70%） was lower than that in the female （16.42%） （[χ2]= 6.92， P < 0.05）， while the rate of the mixed infections in the male （17.28%） was higher than that in the female （4.48%） （[χ2]= 5.91， P < 0.05）. The infection rate of facial skin with symptoms （51.80%） was higher than that of normal facial skin （33.05%） （[χ2]= 9.14， P < 0.01）. There was no significant difference between the infection rate of Demodex mite and the living habits and other factors. Conclusions There is some infection of Demodex in the medical students. The infection rate of facial skin with symptoms is higher than that of the normal facial skin. So we should strengthen the prevention and treatment of Demodex infection in medical students.

Key words: Medical students； Demodex； Infection rate； Influencing factor； Wuhu City

摘要： 目的 调查芜湖市医学院大学生面部蠕形螨感染情况，并分析其影响因素。方法 采用透明胶纸法进行蠕形螨标本采集，以问卷形式对受检者进行蠕形螨感染影响因素调查。结果 共调查学生316人，感染者117人，总感染率为37.03%（117/316），男女感染率差异无统计学意义（[χ2] = 0.00，P > 0.05）。117例感染者中，单纯毛囊蠕形螨感染率（51.28%）、单纯皮脂蠕形螨感染率（24.79%）和混合感染率（23.93%）现象均存在；轻度感染（83.76%）显著高于中度感染（12.82%）、重度感染（3.42%），额部感染居多（29.41%）。其中油性肤质的螨种感染与性别有关，男性皮脂蠕形螨的感染率（3.70%）低于女性皮脂蠕形螨的感染率（16.42%）（[χ2]= 6.92，P < 0.05），而男性混合感染的感染率（17.28%）则高于女性（4.48%）（[χ2]= 5.91，P < 0.05）。面部皮肤有症状的蠕形螨感染率（51.80%）显著高于面部皮肤正常的蠕形螨感染率（33.05%）（[χ2]= 9.14，P < 0.01）。生活习惯等因素对蠕形螨感染率的影响差异无统计学意义。结论 医学生面部存在一定的蠕形螨感染，有皮肤症状人群的蠕形螨感染率显著高于面部皮肤正常者，应加强医学生蠕形螨感染的防治。

关键词: 医学生；蠕形螨；感染率；影响因素；芜湖市