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Table 5 Changes in infection rates with O. volvulus in blackflies in the sentinel communities

From: Impact of long-term treatment of onchocerciasis with ivermectin in Ecuador: potential for elimination of infection

Sentinel community 1995 2000 2004
  Blackflies analysed (N) Infection rate Blackflies analysed (N) Infection rate Blackflies analysed (N) Infection rate
Corriente Grande NP NP 23500 2.1 (0.7–5.0) 12700 0
El Tigre 2550 72.7 (42.0–116.0) 17000 9.0 (4.5–16.1) 10100 6.0 (2.05–13.3)
San Miguel 3550 65.0 (39.0–101.0) 9600 1.1 (0.03–6.4) 12500 0.8 (0.02–4.1)
Playa de Oro NP NP 10250 0 9500 0
Guayabal NP NP 9950 0 10000 0
Angostura NP NP 9700 0 11400 0
Naranjal NP NP 20450 0.5 (0.01–2.8) 26050 0
  1. Infection rates (number of flies infected per 10000 flies) with O. volvulus among Simulium blackflies collected before the start of ivermectin distribution (1995), and during the 2000 and 2004 surveys. Infection rates were calculated using Poolscreen 2.0 software. NP – not performed.