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Table 2 Prevalence of microfilariae in skin snips and community microfilarial load (CMfL), Naiciona, Colombia, 1995–2007. The 95% confidence intervals were calculated by the Poisson Exact method for proportions using the Stata 11® software

From: Elimination of onchocerciasis from Colombia: first proof of concept of river blindness elimination in the world

Year No. of treatment rounds Prevalence in skin snip biopsy (all age groups) Prevalence in skin snip biopsy (15-year-old or older) CMfL
n/N % 95% CI n/N % 95% CI
1995a 0 na na na 36/91 40 27.7–54.8 0.64
1998 4 16/244 6.6 3.7–10.6 10/114 8.8 4.2–16.1 0.07
2001 10 0/143 0 0–2.6 0/91 0 0–4.0 0
2004 16 2/232 0.85 1.0–3.1 2/127 1.6 0.2–5.7 0.0039
2007 22 0/263 0 0–1.4 0/157 0 0–2.3 0
  1. aBaseline data; only people aged 15 years or older were examined in 1995
  2. Abbreviations: na not applicable, 95% CI 95% confidence interval