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English⧼Colon⧽ Summary of the genetic relationships, mosquito vectors, vertebrate hosts, and human disease for the California serogroup (CSG) viruses, expanded from Figure 1B in [21]. Groups are divided based on phylogenetic classification. Relationships reflect the compilation and summary of several phylogenetic analyses [8,14,18,19,20]. Monophyletic groups are shown and reflect that these were consistent in the majority of studies, and ungrouped vertical lines indicate relationship discrepancies of those viruses between phylogenetic studies. Mosquito genera and species from which CSG viruses have been isolated from are listed, and species in bold indicate primary vectors as determined by frequent virus isolations and laboratory transmission studies. Confirmed and likely vertebrate hosts are designated with colored icons and are based on evidence of both serological evidence in the field, and experimental viremias or virus isolations from animals in the field. Grayed icons indicate possible hosts based on either serological evidence or experimental viremias.