title: Blinding trachoma in the northern provinces of Vietnam--a cross sectional survey.
abstract: BACKGROUND
  A prevalence study was conducted in 2001 as part of the SAFE Trachoma Control initiatives in twelve districts of eight northern provinces of Vietnam. The authors present the magnitude and some risk factors of trachomatous trichiasis (TT), trachomatous scarring (TS) and trachomatous corneal opacity (TCO).
  
  
  METHODS
  Ophthalmologists examined 43,677 people of more than 34 years of age, randomly selected. Ophthalmic loupe, torchlight and the trachoma grading card recommended by WHO were used for this examination.
  
  
  RESULTS
  The prevalence of TT was 7.31% (95% CI 7.07-7.55) and 382,950 persons with TT were included in the study population. The rate was higher in females (8.92%) than in males (5.35%). The rate was 13.7% in the district of Me Linh in Vinh Phuc province and in the districts of Ha Tay and Khoai Chau in Hung Yen province, while in the districts of Na Ri (Bac Kan province), Cam Xuyen (Ha Tinh province) and Van Yen (Yen Bai province), the prevalence of TT was less than 2%. The TT rate in the plains was 13%, while in mountainous, coastal and delta terrains, the rate fell to 2.4%, 3.5% and 9.4% respectively. The prevalence of TS and TCO was 8.42% (95% CI 8.21-8.61) and 1.1% (95% CI 1.00-1.20) respectively.
  
  
  CONCLUSIONS
  Although the magnitude of TT is high, the problem of TCO seems to be less serious. The goal of eliminating blinding trachoma from the study area by 2010 represents a big challenge. Based on these survey estimates, the national program could plan resources for the 'S' strategy of trachoma control (surgery for those at immediate risk of blindness).
authors.affiliation: University of British Columbia, Center for Epidemiologic and International Ophthalmolgy, St Paul Hospital, Vancouver, BC, Canada. rajshpp@omantel.net.om
authors.forename: Rajiv
authors.initials: R
authors.lastname: Khandekar
authors.forename: Nguyen Huy
authors.initials: NH
authors.lastname: Nga
authors.forename: Phuong
authors.initials: P
authors.lastname: Mai
mesh_terms: D000328:Adult; D000368:Aged; D001766:Blindness / Q000453:epidemiology* / Q000209:etiology; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D015995:Prevalence; D012424:Rural Population; D014141:Trachoma / Q000150:complications / Q000453:epidemiology*; D014744:Vietnam / Q000453:epidemiology