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Table 3 Total number of parous and examined Simulium ochraceum s.l., the percentage of parous flies, the number of infected flies, and the prevalence of infection (with any Onchocerca volvulus larval stage) per 1,000 parous flies detailed by village and coffee finca for each of the study in the Southern Chiapas focus, Mexico

From: Contribution of migrant coffee labourers infected with Onchocerca volvulusto the maintenance of the microfilarial reservoir in an ivermectin-treated area of Mexico

Locality Village Coffee finca N° of flies parous/examined (% parous) No. of infected flies No. per 1,000 parous flies (95% CI) N° of flies parous/examined (% parous) No. of infected flies No. per 1,000 parous flies (95% CI)
  Planting-clearing season of May-Jul 1997 Harvesting season of Nov 1997-Feb 1998
Locality I     
Las Golondrinas 2,636/3,017 (87.4) 5 1.9§ (0.6–4.4) 2,055/2,636 (78.0) 0 0§ (0–1.8)
Rosario Zacatonal 2,788/3,384 (82.4) 2 0.7 (0.1–2.6) 2,907/3,947 (73.7) 2 0.7 (0.1–2.5)
Finca Palestina 3,538/4,115 (86.0) 7 2.0a,c (0.8–4.1) 4,834/6,786 (71.2) 1 0.2a,d (0–1.2)
Locality II     
Nueva América 828/956 (86.6) 2 2.4 (0.3–8.7) 967/1,534 (63.0) 1 1.0 (0–5.7)
Fincas Victoria, Santa Fé and Fortuna 555/625 (88.8) 5 9.0b,c (2.9–20.9) 2,540/3,341 (76.0) 5 2.0b,d (0.6–4.6)
  Planting-clearing season of May-Jul 1998 Harvesting season of Nov 1998-Feb 1999
Locality I     
Las Golondrinas 1,483/2,098 (70.7) 0 0 (0–2.5) 2,591/3,983 (65.1) 0 (0–1.4)
Rosario Zacatonal 548/874 (62.7) 0 (0–6.7) 384/581 (66.1) 1 2.6 (0.1–14.4)
Finca Palestina N/A N/A 2,304/3,915 (58.9) 2 0.9 (0.1–3.1)
Locality II     
Nueva América 681/1,032 (66.0) 4 5.9§ (1.6–15.0) 3,254/4,957 (65.6) 5 1.5§ (0.5–3.6)
Fincas Victoria, Santa Fé and Fortuna 561/693 (81.0) 1 1.8 (0–9.9) 3,898/6,348 (61.4) 8 2.1 (0.9–4.0)
  1. a, b, c, d Denote statistical significance (p < 0.05) with the same letter indicating the comparison under scrutiny.
  2. § Indicates borderline significance (p = 0.05).
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