Table 3. Number of studies on livestock in Africa identifying potential risk factors as significantly associated seropositivity for Rift Valley fever virus (RVFV).

	Number of articles using statistical methods (out of 70 eligible articles)
Risk factors for seropositivity to RVFV†	Univariate	Multivariate	References
Age††	7	8	[39, 42, 50, 51, 55, 75–83]
Species	5	1	[22, 42, 55, 56, 78, 84]
Sex*	1	1	[51, 53]
Animal introduced into herd	1	1	[50, 79]
Nearby water point	0	2	[43, 76]

† risk factors were only included in this table if they were found to be significant in at least two articles

*sex was identified as a risk factor for RVFV seropositivity in a number of studies, but the conclusions were contradictory (see text)

††RVFV seroprevalence increased with age