Table 2.

Moderating variables studied in the meta-analyses.

Moderating Variable	Definition	Classes *
Mosquito species	Taxon to which the tested individuals belong	Aedes caspius Aedes detritus Aedes vexans	Culex pipiens Culex theileri
Viral titer of the blood meal	Titer of virus in the blood on which the mosquitoes took their blood meal, i.e., host viremia in the case of a live host or titer of virus in the artificial feeder	Low Low to medium Medium	Medium to high High
Rearing generation of mosquitoes	Field-collected or colonized lines of mosquitoes	F0/F1 (field-collected mosquitoes or first generation) F2/F5 (colonized mosquitoes between second and fifth generation) >F5 (mosquitoes over five generations of laboratory colonization)
Rearing temperature	Temperature at which mosquitoes were kept during incubation	<20 °C 20–25 °C >25 °C 13 then 26 °C	20 then 28 °C 22–26 °C 26 °C (day)/22 °C (night)
Viral strain	Viral strain used to infect mosquitoes	AN 1830 AnD133719 ArD141967 Clone 13 Kenya-128B-15 Lunyo RVF MP-12 SH172805	strain 35/74 strain 56/74 T1 unknown (‘wild type’) ZH501 ZH501 or Dak ArB 1976 † ZH501 or Egypt93 † ZH548
Time period between exposure and assays	Time between infectious blood meal and assay for mosquito infection (or dissemination or transmission)	Period known precisely ≤1 week >1 to ≤2 weeks >2 to ≤3 weeks >3 to ≤4 weeks >4 weeks	Period provided as a range <1 to ≤2 weeks <1 to ≤3 weeks <1 to ≤4 weeks >1 to ≤3 weeks >1 to ≤4 weeks >1 to >4 weeks >2 to 4 weeks
Country	Country of origin of the mosquito strain	Algeria Canada Cyprus Egypt UK France Germany Lebanon	Morocco Netherlands Senegal South Africa Spain Tunisia USA

* See text for class definitions. ^† Both viral strains are used in the same study without distinction.