การศึกษาความชุกของการตรวจพบไรเดโมเด็กซ์บนใบหน้าของผู้ที่มาตรวจสุขภาพที่โรงพยาบาลจุฬาลงกรณ์ / วีรุทัย สภานนท์ = Prevalence of Demodex species on the face of people who visit King Chulalongkorn Memorial Hospital for routine check up / Veeruthai Sabhanond
Background : Demodex are follicular mites found in human. Their roles in causing diseases are still inconclusive. Generally, it is human normal flora but in some situations it can cause unspecified dermatological concerns. To date, The diagnostic criteria for Demodicosis is equivocal ; leading to inappropriately use of antiparasite against Demodex. Moreover, the data in our population is lacking Objective : To determine the prevalence of Demodex species in our population and compare the outcomes with various factors. Materials and Methods : A group of people was randomly selected from patients at Preventive medicine department, Chulalongkorn memorial hospital from July 2009 to January 2010. First, the participants completed the questionnaires about possibly related factors. Then the skin scrapings for scales with distinct areas of forehead, cheeks, nose and chin were done. Then the scales were prepared and traced for Demodex. In the settings that at least one Demodex was found it is reported positive. On the other hand, negative was reported in case that there is no evidence of Demodex. Results : From 200 participants, The ratio of female : male are 137: 63. Age range equal 18 to 73 years old. 41 participants were found to be positive for Demodex, which is 20.5%. The most prominent area was nose and D.folliculorum was pronounce. The density was mostly one Demodex per person. The statistically significant associating factor with the presence of Demodex was combination to oily skin complexion (P-value = 0.000) While non facial itching was found to be statistically significant associated with the unpresence of Demodex (p-value = 0.022). These two factors were found to be independence. Conclusions : The prevalence of Demodex species in our population is 20.5% which is quite a significant number. That means in normal population, Demodex are able to be found.
