Type of vaccine	Random‐effects model		Fixed‐effect model		Heterogeneity test
	Risk ratio (95% CI)	Z statistics	Risk ratio (95% CI)	Z statistics
Rhesus tetravalent vaccine (RRV‐TV)	0.58 (0.47 to 0.72)	4.96, P < 0.00001	0.59 (0.54 to 0.64)	11.96, P < 0.00001	Chi squared 51.64, df 10, P < 0.00001, I squared 80.6%
Rhesus monovalent vaccine (RRV, RRV‐D, RRV‐DS1, or RRV‐ST3)	0.60 (0.46 to 0.78)	3.85, P 0.0001	0.59 (0.47 to 0.75)	4.42, P < 0.00001	Chi squared 9.80, df 8, P 0.28, I squared 18.4%
Bovine vaccine (RIT‐4237)	0.65 (0.48 to 0.86)	2.96, P 0.003	0.68 (0.58 to 0.79)	4.84, P < 0.00001	Chi squared 19.77, df 9, P 0.02, I squared 54.5%
Bovine vaccine (WC3)	0.77 (0.46 to 1.28)	1.00, P 0.32	0.85 (0.66 to 1.10)	1.22, P 0.22	Chi squared 5.09, df 2, P 0.08, I squared 60.7%
Bovine‐human vaccine (W179‐9)	0.33 (0.19 to 0.56)	4.00, P 0.00001	0.29 (0.17 to 0.51)	4.36, P < 0.0001	Chi squared 1.58, df 2, P 0.45, I squared 0%
Human vaccine (89‐12)	0.32 (0.23 to 0.45)	6.52, P < 0.00001	0.31 (0.22 to 0.44)	6.60, P < 0.00001	Chi squared 0.79, df 1, P 0.37, I squared 0%