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Table 4 Seasonal biting density (SBD), prevalence of infective flies (PIF), and seasonal transmission potential (STP) estimates of S. metallicum (2007–2012) in the sentinel communities of the north-east onchocerciasis focus, Venezuela

From: Interruption of Onchocerca volvulus transmission in Northern Venezuela

Community

Flies collected

SBDγ(CI)ψ

PIFδ(CI)ψ

STPθ(CI)ψ

La Carapa (2007–2008)

12,014

41,764

0 (0–0.3)

0 (0–6.3)

Voladero (2007–2008)

6,192

13,538

0 (0–0.6)

0 (0–4.1)

Santa Marta (2007–2008)

6,201

9,826

0 (0–0.6)

0 (0–2.9)

Caituco (2007–2008)

5,855

55,884

0 (0–0.7)

0 (0–19.6)

Focus (2007–2008)

30,262

17,757

0

0

(16,362 –19,257)

(0–0.1)

(0–0.9)

La Carapa (2011)

5,642

18,528

0 (0–0.7)

0 (0–6.5)

Voladero (2011)

1,241

2,907

0 (0–3.1)

0 (0–4.5)

Santa Marta (2011)

2,423

12,799

0 (0–1.6)

0 (0–10.2)

Caituco (2011)

4,155

15,511

0 (0–0.9)

0 (0–7.0)

La Cuesta (2011)

3,255

5,617

0 (0–1.2)

0 (0–3.4)

Focus (2011)

16,712

6,199

0

0

(5,717 – 6,719)

(0–0.2)

(0–0.6)

Caituco (2012)

3,923

13,034 (11,652 – 14,569)

0 (0–1.0)

0 (0–3.4)

  1. ψThe associated 95% Confidence Intervals (CIs) surrounding the point estimate.
  2. γSBD: Mean number (geometric mean) of S. metallicum bites per person per season.
  3. δNumber of positive (heads) for O. volvulus L3 per 2 000 flies examined.
  4. θSTP: SBD x prevalence of infective flies x mean number of L3 per infective fly.