Revista de Salud Pública
Print version ISSN 0124-0064
GALVIS-RAMIREZ, Virgilio; TELLO-HERNANDEZ, Alejandro; ALVAREZ-OSORIO, Leonardo and REY-SERRANO, Juan J.. The prevalence of Demodex folliculorum infection in patients attending a general ophthalmological consultation. Rev. salud pública [online]. 2011, vol.13, n.6, pp. 990-997. ISSN 0124-0064. http://dx.doi.org/10.1590/S0124-00642011000600011.
Objectives Determining Demodex folliculorum infection prevalence in patients attending general ophthalmological consultation and such infection's association with blepharitis. Methods This was a descriptive study of such prevalence. 128 subjects who attended the Virgilio Galvis Eye Centre were randomly selected and the presence of D. folliculorum was determined in 4 eyelashes taken from each of them. Results D. folliculorum infection prevalence was 42.1 % (n=54); blepharitis was diagnosed in 38.3 % of the patients (n=49) and 63.2 % of them (n=31) were positive for D. folliculorum. Only 29.2 % of the individuals in the group without blepharitis (n=79) had mites (n=23) (p=0.0003). A higher number of parasites was found in patients with blepharitis (12.7 parasitic load index cf 5.1; p=0.0001); 25 % (n=32) of the participants had scaling in the form of cylinders and 96.9 % of these had the mites (n=31), whereas the mite was only present in 24 % (n=23) of subjects who had no cylinder-type scaling (n=96). Conclusions Demodex folliculorum is a parasite found in people without ocular lesions; however, it is more frequent and has a higher parasite burden in patients with blepharitis. Our results suggested the need for investigating the presence of D. folliculorum in all patients suffering from blepharitis, especially in cases where cylinder-type scaling has been observed in their eyelashes.
Keywords : Blepharitis; diseases of the eyelids and eyelashes.