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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

Mawlouth Diallo*Comments to Author , Yamar Ba*, Amadou A. Sall*, Ousmane M. Diop*, Jacques A. Ndione†, Mireille Mondo*, Lang Girault*, and Christian Mathiot*
Author affiliations: *Institut Pasteur de Dakar, Dakar, Senegal; †Université Cheikh Anta Diop de Dakar, Senegal

Main Article

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.

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