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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