| | | | | Arthropod species & virus source(a) | Method of Infection log10/ml (b) | Incubation period (c) | Transmision by bite (d) | Assay of arthropod, log10/ml (e) |
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| Feeding | Injected | Days | °C | Host | Ratio | Whole | Organ | System |
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| | Mosquito infection by feeding and transmission by bite: Aedes aegypti, albopictus, atropalpus, canadensis, mediovittatus, sollicitans, triseriatus, vexans; Culex pipiens, tarsalis; Anopheles freeborni, quadrimaculatus, stephensi; Mansonia indubitans, titillans; Psorophora confinnis (24). For others, see References 17, 18. | | Epidemic cycle probably involves many species of pest mosquitoes, with the horse as main vertebrate host and source of mosquito infection. Enzootic cycles of non-epidemic strains involve mainly Culex (Melanoconion) mosquitoes and wild rodents. Enzootic cycles of epidemis strains not known. | | | | | | | | | | |
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