Background
Methods
Study Area
Mosquito collection
Virus isolation and identification
Data analysis
Results
Mosquito collection
Species | Ponds | Villages | Total | |||
---|---|---|---|---|---|---|
No collected (males) | % | No collected (males) | % | No collected (males) | % | |
Aedomya africana
| 7 | 0 | 0 | 0 | 7 | 0 |
Aedes aegypti
| 110 (20) | 0.3 | 10 | 0.2 | 120 (20) | 0.3 |
Aedes argenteopunctatus
| 258 | 0.7 | 14 | 0.3 | 272 | 0.6 |
Aedes dalzieli
| 1297 (3) | 3.5 | 94 | 1.7 | 1391 (3) | 3.2 |
Aedes fowleri
| 120 | 0.3 | 73 | 1.3 | 193 | 0.4 |
Aedes furcifer
| 205 | 0.5 | 1 | 0 | 206 | 0.5 |
Aedes hirsutus
| 29 | 0.1 | 1 | 0 | 30 | 0.1 |
Aedes luteocephalus
| 22 | 0.1 | 3 | 0.1 | 25 | 0.1 |
Aedes mcintoshi
| 5 | 0 | 3 | 0.1 | 8 | 0 |
Aedes metallicus
| 18 (1) | 0 | 2 | 0 | 37 (1) | 0.1 |
Aedes minutus
| 156 | 0.4 | 54 | 1 | 210 | 0.5 |
Aedes ochraceus
| 1377 (1) | 3.7 | 627 | 11.2 | 2004 (1) | 4.7 |
Aedes sudanensis
| 659 (9) | 1.8 | 115 | 2.1 | 774 (9) | 1.8 |
Aedes unilineatus
| 21 (1) | 0.1 | 0 | 0 | 21 (1) | 0 |
Aedes vexans
| 8546 (12) | 22.9 | 2751 | 49.1 | 11297 (12) | 26.3 |
Aedes vittatus
| 0 | 0 | 1 | 0 | 1 | 0 |
Anopheles coustani
| 1 | 0 | 0 | 0 | 1 | 0 |
Anopheles funestus
| 1 | 0 | 0 | 0 | 1 | 0 |
Anopheles gambiae
| 122 (8) | 0.3 | 86 | 1.5 | 208 (8) | 0.5 |
Anopheles pharoensis
| 256 (13) | 0.7 | 37 | 0.7 | 293 (13) | 0.7 |
Anopheles rufipes
| 15 | 0 | 96 | 1.7 | 111 | 0.3 |
Anopheles squamosus
| 54 (5) | 0.1 | 44 | 0.8 | 98 (5) | 0.2 |
Anopheles ziemanni
| 2396 (4) | 6.4 | 250 | 4.5 | 2646 (4) | 6.2 |
Culex annulioris
| 0 | 0 | 17 | 0.3 | 17 | 0 |
Culex antennatus
| 1264 (10) | 3.4 | 114 | 2 | 1378 (10) | 3.2 |
Culex bitaeniorhynchus
| 533 (1) | 1.4 | 76 | 1.4 | 609 (1) | 1.4 |
Culex decens
| 18 | 0 | 0 | 0 | 18 | 0 |
Culex ethiopicus
| 1107 (12) | 3 | 55 | 1 | 1162 (12) | 2.7 |
Culex neavei
| 4077 (459) | 10.9 | 146 | 2.6 | 4223 (459) | 9.8 |
Culex nebulosus
| 2 | 0 | 10 | 0.2 | 12 | 0 |
Culex perfuscus
| 525 | 1.4 | 22 | 0.4 | 547 | 1.3 |
Culex poicilipes
| 7382 (113) | 19.7 | 502 | 9 | 7884 (113) | 18.3 |
Culex quinquefasciatus
| 13 (1) | 0 | 72 (1) | 1.3 | 84 (1) | 0.2 |
Culex sp
| 3 | 0 | 0 | 0 | 3 | 0 |
Culex tigripes
| 4 | 0 | 0 | 0 | 4 | 0 |
Culex tritaeniorhynchus
| 1470 (9) | 3.9 | 176 | 3.1 | 1646 (9) | 3.8 |
Mansonia africana
| 810 (162) | 2.2 | 32 | 0.6 | 842 (162) | 2 |
Mansonia uniformis
| 4110 (191) | 11 | 112 | 2 | 4222 (191) | 9.8 |
Mimomyia mimomyiaformis
| 57 | 0.2 | 0 | 0 | 57 | 0.1 |
Mimomyia plumosa
| 115 (1) | 0.3 | 4 | 0.1 | 119 (1) | 0.3 |
Mimomyia splendens
| 224 (34) | 0.6 | 0 | 0 | 224 (34) | 0.5 |
Uranotaenia mayeri
| 3 | 0 | 0 | 0 | 3 | 0 |
Total collected (males) | 37392 (1070) | 100 | 5600 (1) | 100 | 42992 (1071) | 100 |
Virus | Year of isolation | Family | Mosquitoes found infected in this study | Vertebrates associated | Pathogen potential |
---|---|---|---|---|---|
Acado | 2013 |
Reoviridae
|
Culex antennatus, Cx. neavei, Mansonia uniformis
| Humans, domestic ungulates, | unknown |
Bagaza | 2012 |
Flaviviridae
|
Culex antennatus, Cx. neavei
| Humans, wild birds, red-legged partridges and ring-necked pheasants, common wood pigeons | Unknown |
2013 |
Cx. neavei
| ||||
Barkedji | 2012 |
Flaviviridae
|
Cx. neavei, Ae. sudanensis
| Unknown | Unknown |
2013 |
Cx. neavei
| ||||
Ndumu | 2012 |
Togaviridae
|
Aedes dalzieli, Ae. vexans, Anopheles rufipes, An. ziemanni, Cx. poicilipes, Ma. uniformis
| Domestic pigs, Humans | Unknown |
Rift valley fever | 2013 |
Bunyaviridae
|
Ae. ochraceus
| Yes | |
Sanar | 2013 |
Reoviridae
|
Cx. neavei, Ma. uniformis
| Unknown | Unknown |
Sindbis | 2012 |
Togaviridae
|
Cx. antennatus, Cx. neavei
| Humans, Birds, Orangutans, Sheeps, frogs, reed warblers, Bats | Yes |
2013 |
Cx. neavei
| ||||
Usutu | 2012 |
Flaviviridae
|
Culex antennatus, Cx. neavei
| Human, African furred rat, blackbirds, Bats | Yes |
2013 |
Cx. neavei
| ||||
West Nile | 2012 |
Flaviviridae
|
Ae. dalzieli, An. rufipes, Cx. antennaus, Cx. neavei, Cx. perfuscus, Cx. poicilipes, Cx. quinquefasciatus
| Horses, Birds, Human | Yes |
2013 |
Cx. neavei, Cx. tritaeniorhynchus
| ||||
Yaounde | 2012 |
Flaviviridae
|
Cx. tritaeniorhynchus
| Bird (Bycanistes sharpii), Rodents (Praomys sp., Cavia porcellus) | Unknown |
Viruses
Species | ACAV | BAGV | BARV | NDUV | RVFV | SANV | SINV | USUV | WNV | YAOV | Total | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | MFIR | P+ | |
Aedes dalzieli
| 1 | 0.7 | 1 | 0.7 | 2 | ||||||||||||||||
Aedes ochraceus
| 1 | 0.5 | 1 | ||||||||||||||||||
Aedes sudanensis
| 1 | 1.4 | 1 | ||||||||||||||||||
Aedes vexans
| 1 | 0.9 | 1 | ||||||||||||||||||
Anopheles rufipes
| 1 | 10.0 | 1 | 10.0 | 2 | ||||||||||||||||
Anopheles ziemanni
| 1 | 0.4 | 1 | ||||||||||||||||||
Culex antennatus
| 1 | 0.7 | 1 | 0.7 | 1 | 0.7 | 1 | 0.7 | 1 | 0.7 | 2 | 1.5 | 3 | 2.2 | 10 | ||||||
Culex neavei
| 5 | 1.3 | 2 | 0.5 | 16 | 4.3 | 4 | 1.1 | 12 | 3.2 | 9 | 2.4 | 22 | 5.8 | 70 | ||||||
Culex perfuscus
| 1 | 1.8 | 1 | ||||||||||||||||||
Culex poicilipes
| 1 | 0.1 | 1 | 0.1 | 2 | ||||||||||||||||
Culex quinquefasciatus
| 1 | 12.5 | 1 | ||||||||||||||||||
Culex tritaeniorhynchus
| 1 | 0.6 | 1 | 0.6 | 2 | ||||||||||||||||
Mansonia africana
| 1 | 1.5 | 1 | 1.5 | 2 | ||||||||||||||||
Mansonia uniformis
| 3 | 0.7 | 3 | ||||||||||||||||||
Culex neavei male | 1 | 1 | 2 | ||||||||||||||||||
Mansonia uniformis male | 1 | 1 | 2 | ||||||||||||||||||
Total | 8 | 3 | 18 | 9 | 1 | 7 | 13 | 12 | 31 | 1 | 103 |
West Nile virus
Virus | July | September | October | November | December | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Species | No | NP | P+ | MFIR | No | NP | P+ | MFIR | No | NP | P+ | MFIR | No | NP | P+ | MFIR | No | NP | P+ | MFIR | |
WNV |
Aedes dalzieli
| 367 | 52 | 0 | 0.0 | 108 | 46 | 0 | 0.0 | 7 | 6 | 1 | 142.9 | 0 | 0 | 0 | 0.0 | 0 | 0 | 0 | 0.0 |
Anopheles rufipes
| 1 | 1 | 0 | 0.0 | 33 | 9 | 0 | 0.0 | 61 | 10 | 1 | 16.4 | 8 | 6 | 0 | 0.0 | 8 | 6 | 0 | 0.0 | |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 2 | 2.0 | 96 | 35 | 1 | 10.4 | 0 | 0 | 0 | 0.0 | |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 3 | 4.5 | 1193 | 78 | 6 | 5.0 | 1721 | 128 | 13 | 7.6 | 104 | 25 | 0 | 0.0 | |
Culex perfuscus
| 155 | 16 | 1 | 6.5 | 222 | 64 | 0 | 0.0 | 64 | 21 | 0 | 0.0 | 0 | 0 | 0 | 0.0 | 0 | 0 | 0 | 0.0 | |
Culex poicilipes
| 19 | 6 | 0 | 0.0 | 3168 | 149 | 0 | 0.0 | 2401 | 114 | 1 | 0.4 | 1974 | 113 | 0 | 0.0 | 4 | 4 | 0 | 0.0 | |
Culex quinquefasciatus
| 4 | 2 | 1 | 250.0 | 13 | 6 | 0 | 0.0 | 23 | 3 | 0 | 0.0 | 20 | 5 | 0 | 0.0 | 20 | 5 | 0 | 0.0 | |
Culex tritaeniorhynchus
| 842 | 48 | 0 | 0.0 | 98 | 40 | 0 | 0.0 | 343 | 47 | 1 | 2.9 | 14 | 12 | 0 | 0.0 | 0 | 0 | 0 | 0.0 | |
Total vectors | 1446 | 146 | 2 | 1.4 | 4487 | 488 | 3 | 0.7 | 5082 | 350 | 12 | 2.4 | 3833 | 299 | 14 | 3.7 | 136 | 40 | 0 | 0.0 | |
USUV |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 1 | 1.0 | 96 | 35 | 1 | 10.4 | 0 | 0 | 0 | 0.0 |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 3 | 4.5 | 1193 | 78 | 2 | 1.7 | 1721 | 128 | 4 | 2.3 | 104 | 25 | 0 | 0.0 | |
Total vectors | 58 | 21 | 0 | 0.0 | 845 | 174 | 3 | 3.6 | 2183 | 149 | 3 | 1.4 | 1817 | 163 | 5 | 2.8 | 104 | 25 | 0 | 0.0 | |
ACAV |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 0 | 0.0 | 96 | 35 | 1 | 10.4 | 0 | 0 | 0 | 0.0 |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 0 | 0.0 | 1193 | 78 | 1 | 0.8 | 1721 | 128 | 4 | 2.3 | 104 | 25 | 0 | 0.0 | |
Mansonia africana
| 0 | 0 | 0 | 0.0 | 64 | 30 | 0 | 0.0 | 76 | 17 | 0 | 0.0 | 256 | 31 | 0 | 0.0 | 263 | 20 | 1 | 3.8 | |
Total vectors | 58 | 21 | 0 | 0.0 | 909 | 204 | 0 | 0.0 | 2259 | 166 | 1 | 0.5 | 2073 | 194 | 5 | 2.8 | 367 | 45 | 1 | 2.7 | |
BAGV |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 1 | 1.0 | 96 | 35 | 0 | 0.0 | 0 | 0 | 0 | 0.0 |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 0 | 0.0 | 1193 | 78 | 0 | 0.0 | 1721 | 128 | 2 | 1.2 | 104 | 25 | 0 | 0.0 | |
Total vectors | 58 | 21 | 0 | 0.0 | 845 | 0 | 0.0 | 2183 | 149 | 1 | 0.5 | 1817 | 163 | 2 | 1.1 | 104 | 25 | 0 | 0.0 | ||
BARV |
Aedes sudanensis
| 15 | 8 | 0 | 0.0 | 517 | 103 | 1 | 1.9 | 111 | 36 | 0 | 0.0 | 2 | 2 | 0 | 0.0 | 0 | 0 | 0 | 0.0 |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 2 | 3.0 | 1193 | 78 | 4 | 3.4 | 1721 | 128 | 10 | 5.8 | 104 | 25 | 0 | 0.0 | |
Total vectors | 27 | 14 | 0 | 0.0 | 1186 | 200 | 3 | 2.5 | 1304 | 114 | 4 | 0.0 | 1723 | 130 | 10 | 0.0 | 104 | 25 | 0 | 0.0 | |
NDUV |
Aedes dalzieli
| 367 | 52 | 0 | 0.0 | 108 | 46 | 0 | 0.0 | 7 | 6 | 1 | 142.9 | 0 | 0 | 0 | 0.0 | 0 | 0 | 0 | 0.0 |
Aedes vexans
| 6603 | 187 | 0 | 0.0 | 1408 | 102 | 0 | 0.0 | 278 | 44 | 1 | 3.6 | 4 | 4 | 0 | 0.0 | 0 | 0 | 0 | 0.0 | |
Anopheles rufipes
| 1 | 1 | 0 | 0.0 | 33 | 9 | 0 | 0.0 | 61 | 10 | 1 | 16.4 | 8 | 6 | 0 | 0.0 | 8 | 6 | 0 | 0.0 | |
Anopheles ziemanni
| 6 | 6 | 0 | 0.0 | 1879 | 129 | 1 | 0.5 | 434 | 44 | 0 | 0.0 | 62 | 33 | 0 | 0.0 | 10 | 8 | 0 | 0.0 | |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 0 | 0.0 | 96 | 35 | 0 | 0.0 | 0 | 0 | 0 | 0.0 | |
Culex poicilipes
| 19 | 6 | 0 | 0.0 | 3168 | 149 | 0 | 0.0 | 2401 | 114 | 1 | 0.4 | 1974 | 113 | 0 | 0.0 | 4 | 4 | 0 | 0.0 | |
Mansonia uniformis
| 0 | 0 | 0 | 0.0 | 2277 | 142 | 3 | 1.3 | 864 | 70 | 0 | 0.0 | 127 | 30 | 0 | 0.0 | 2 | 2 | 0 | 0.0 | |
Total vectors | 7042 | 267 | 0 | 0.0 | 9049 | 654 | 4 | 0.4 | 5035 | 359 | 4 | 1.0 | 2271 | 221 | 0 | 0.0 | 24 | 20 | 0 | 0.0 | |
SANV |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 0 | 0.0 | 96 | 35 | 1 | 10.4 | 0 | 0 | 0 | 0.0 |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 0 | 0.0 | 1193 | 78 | 0 | 0.0 | 1721 | 128 | 4 | 2.3 | 104 | 25 | 0 | 0.0 | |
Mansonia africana
| 0 | 0 | 0 | 0.0 | 64 | 30 | 0 | 0.0 | 76 | 17 | 0 | 0.0 | 256 | 31 | 0 | 0.0 | 263 | 20 | 1 | 3.8 | |
Total vectors | 58 | 21 | 0 | 0.0 | 909 | 204 | 0 | 0.0 | 2259 | 166 | 0 | 0.0 | 2073 | 194 | 5 | 2.8 | 367 | 45 | 1 | 2.7 | |
SINV |
Culex antennatus
| 46 | 15 | 0 | 0.0 | 176 | 77 | 0 | 0.0 | 990 | 71 | 0 | 0.0 | 96 | 35 | 1 | 10.4 | 0 | 0 | 0 | 0.0 |
Culex neavei
| 12 | 6 | 0 | 0.0 | 669 | 97 | 1 | 1.5 | 1193 | 78 | 5 | 4.2 | 1721 | 128 | 6 | 3.5 | 104 | 25 | 0 | 0.0 | |
Total vectors | 58 | 21 | 0 | 0.0 | 845 | 174 | 1 | 1.2 | 2183 | 149 | 5 | 2.3 | 1817 | 163 | 7 | 3.9 | 104 | 25 | 0 | 0.0 | |
RVFV |
Aedes ochraceus
| 83 | 17 | 0 | 0.0 | 1250 | 110 | 1 | 0.8 | 516 | 53 | 0 | 0.0 | 5 | 4 | 0 | 0.0 | 0 | 0 | 0 | 0.0 |
YAOV |
Culex tritaeniorhynchus
| 842 | 48 | 1 | 1.2 | 98 | 40 | 0 | 0.0 | 343 | 47 | 0 | 0.0 | 14 | 12 | 0 | 0.0 | 0 | 0 | 0 | 0.0 |