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Table 1 Population (number examined), number positive for Onchocerca volvulus mf [prevalence], and mean microfilaridermia (arithmetic mean no. of mf/mg and community microfilarial load) at beginning of coffee planting-clearing and harvesting seasons of 1997–1998 and 1998–1999 in localities I (villages of Golondrinas, Rosario Zacatonal, and finca Palestina), and II (village of Nueva América, and fincas of Victoria, Fortuna, and Santa Fé) in Southern Chiapas, Mexico

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

Localities Residents Migrants Ratio of migrants to residents
  Population (Examined) Pos [Prev] (95% CI) AM mf/mg (CMFL) Population (Examined) Pos [Prev] (95% CI) AM mf/mg (CMFL)  
Planting season (May-July 1997)
Locality I 437 (318) 36 [11.3%] (8.1–15.3) 0.28 (0.19) 45 (30) 7 [23.3%] (9.9–42.3) 0.78 (0.71) 0.1 : 1
Locality II 374 (235) 34 [14.4%] (10.2–19.6) 1.27 (0.51) 350 (204) 12 [5.9%] (3.1–10.0) 0.12 (0.08) 0.9 : 1
Harvesting season (November 1997–February 1998)
Locality I 385 (250) 32 [12.8%] (8.9–17.6) 0.25 (0.14) 130 (48) 3 [6.3%] (1.3–17.2) 0.54 (0.23) 0.3: 1
Locality II 350 (198) 15 [7.6%] (4.3–12.2) 0.53 (0.22) 850 (258) 7 [2.7%] (1.1–5.5) 0.07 (0.03) 2.4 : 1
Planting season (May-July 1998)
Locality I 370 (236) 30 [12.7%] (8.7–17.6) 0.18 (0.11) N/A N/A N/A N/A
Locality II 350 (61) 4 [6.6%] (1.8–15.9) 0.06 (0.05) 600 (68) 6 [8.8%] (3.3–18.2) 0.22 (0.09) 1.7 : 1
Harvesting season (November 1998–February 1999)
Locality I 370 (187) 7 [3.7%] (1.5–7.6) 0.11 (0.06) 35 (14) 2 [14.3%] (1.8–42.8) 1.58 (0.39) 0.1 : 1
Locality II N/A N/A N/A 190 (168) 9 [5.4%] (2.5–9.9) 0.26 (0.12) N/A
  1. N/A: Data not available.
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