Volume 10, Number 5—May 2004
Dispatch
Rift Valley Fever in Chad
David Ringot*
, Jean-Paul Durand†, Hughes Tolou†, Jean-Paul Boutin†, and Bernard Davoust‡
, Jean-Paul Durand†, Hughes Tolou†, Jean-Paul Boutin†, and Bernard Davoust‡
Table 2
Results of the cross-sectional investigation of Rift Valley fever antibody prevalence among sheep, goats, and horned cattle, Chad, 2002 rainy seasona
| Animal | Average age (y) | IgG+b animals (%) | Average age of IgG+ animals (y) | IgG+ animals age <1 y (% of those age <1 y) | % of animals killed in an area that were IgG+ | Sex of IgG+ animals | IgG+ animals confirmed by WB | IgM+ animals (% IgG+) |
|---|---|---|---|---|---|---|---|---|
| Sheep |
2.3 |
32/300 (10.7) |
1.8 |
8 (12) |
14.8% N, 1.1% A |
7.5% of M, 12.8% of F |
31 |
16 (53.3) |
| Goats |
1.7 |
12/139 (8) |
2.2 |
4 (6) |
9% N, 5% A |
6.7% of M, 10.8% of F |
NA |
4 (33.3) |
| Horned cattle |
7.5 |
5/114 (4) |
6.2 |
NA |
5% N, 0% A |
0% of M, 4.7% of F |
NA |
NA |
| Total | 3.2 | 49/553 (8) | 2.8 | 14 (10.5) | 11% N, 2% A | 4.4% of M, 11.4% of F | NA | 20 (45.4) |
aIg, immunoglobulin; WB, Western blot; N, N’Djamena; A, Abéché; NA, not available.
bSerum positivity was established when the ratio between the optical density of the Rift Valley fever virus antigen and that of the Dugbe antigen was >3.5.
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