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Table 5 Seasonal biting density (SBD), prevalence of infective flies (PIF), and seasonal transmission potential (STP) estimates of S. metallicum in the extra-sentinels communities of the North-east onchocerciasis focus, Venezuela, during 2010 and 2012

From: Interruption of Onchocerca volvulus transmission in Northern Venezuela

Community

Flies collected

SBDγ(CI)ψ

PIFδ(CI)ψ

STPθ(CI)ψ

Manapire Abajo (2010)

4,208

18,856

0 (1–0.9)

0 (1–8.5)

Guayabal (2010)

9,491

37,007

0 (0–0.4)

0 (0–7.4)

Sabaneta (2010)

4,135

32,764

0 (0–0.2)

0 (0–3.3)

Naranjal (2010)

7,992

31,056

0 (0–0.5)

0 (0–7.8)

El Filudo (2010)

5,144

21,084

0 (0–0.7)

0 (0–7.4)

Focus (2010)

30,970

39,155

0

0

(36,703 – 41,763)

(0–0.1)

(0–2.0)

Guayabal (2012)

2,411

10,281 (9,612–11,700)

0 (0–1.6)

0 (0–8.2)

Naranjal (2012)

4,321

10,453 (9,256–11,786)

0 (0–0.9)

0 (0–4.7)

  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.