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