Volume 9, Number 3—March 2003
Research
Amplification of the Sylvatic Cycle of Dengue Virus Type 2, Senegal, 1999–2000: Entomologic Findings and Epidemiologic Considerations
, Yamar Ba*, Amadou A. Sall*, Ousmane M. Diop*, Jacques A. Ndione†, Mireille Mondo*, Lang Girault*, and Christian Mathiot*
Table 1
Mosquitoes collected and dengue virus serotype 2 infection rates of potential vectors, Kedougou, 1999
| Species | June |
October |
November |
Total |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. specimens captured | (No. positive/ total pools) | No. specimens captured | (No. positive/ total pools) | True infection ratea | No. specimens captured | (No. positive/ total pools) | True infection ratea | No. specimens captured | (No. positive/ total pools) | True infection ratea | ||||
| Aedes furcifer male |
2 |
(0/1) |
– |
(0/0) |
– |
27 |
(0/6) |
– |
– |
29 |
(0/7) |
- |
- |
|
| Ae. furcifer female |
1,132 |
(0/36) |
1,998 |
(10/56) |
1.72 |
[0.34] |
1,398 |
(25/41) |
2.84 |
[0.58] |
4,528 |
(35/133) |
0.91 |
[0.15] |
| Ae. taylori male |
21 |
(0/7) |
2 |
(0/1) |
– |
– |
32 |
(0/5) |
– |
– |
55 |
(0/13) |
- |
- |
| Ae. taylori female |
358 |
(0/12) |
122 |
(1/5) |
0.92 |
[0.92] |
543 |
(10/19) |
2.63 |
[0.85] |
1,023 |
(11/36) |
1.28 |
[0.39] |
| Ae. luteocephalus female |
1,064 |
(0/35) |
682 |
(8/22) |
1.45 |
[0.52] |
392 |
(8/13) |
3.06 |
[1.17] |
2,138 |
(16/70) |
0.84 |
[0.21] |
| Ae. aegypti female |
54 |
(0/8) |
6 |
(0/2) |
– |
– |
15 |
(2/4) |
17 |
[11.57] |
75 |
(2/14) |
2.74 |
[1.97] |
| Other mosquitoesb | 5,549 | (0/197) | 3,366 | (0/165) | – | – | 7,984 | (0/276) | – | – | 24,747 | (0/638) | - | - |
aTrue infection rate (ratio in percentage of the number of dengue virus serotype 2 strains isolated/total number of mosquitoes captured); [standard error]; –, no data obtained.
bOther mosquitoes: Anopheles coustani, An. ziemanni, An. brohieri, An. brunnipes, An. domicola, An. flavicosta, An. funestus, An. gambiae s.l., An. hancoki, An. maculipalpis, An. nili, An. pharoensis, An. pretoriensis, An. rufipes, An. squamosus, Ae. argenteopunctatus, Ae. centropunctatus, Ae. dalzieli, Ae. fowleri, Ae. hirsutus, Ae. minutus, Ae. ochraceus, Ae. vexans, Ae. vittatus, Ae; mcintoshi, Ae. cozi, Ae. metallicus, Ae. neoafricanus, Ae. unilineatus, Culex annulioris, Cx. antennatus, Cx. bitaeniorhynchus, Cx. decens, Cx. duttoni, Cx. ethiopicus, Cx. neavei, Cx. perfuscus, Cx. poicilipes, Cx. tritaeniorhynchus, Cx. cinereus, Cx. nebulosus, Cx. tigripes, Mansonia africana, Ma. uniformis, Mimomyia mediolineata, Mi. mimomyiaformis, Mi. plumosa, Uranotaenia fusca, Ur. mashonaensis, Ur. balfouri, and Ur. mayeri.