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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.