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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.