Table 4.

Virus neutralizing antibody responses in sera of rhesus monkeys from challenge study

Vaccine	PRNT50 value (mIU/mL) on study day
	Day 0		Day 30		Day 60		Day 90		Day 104
	Mean	SEM	Mean	SEM	Mean	SEM	Mean	SEM	Mean	SEM
YFE-1	108	0	267*	72.6	1,427**	729	3,316	1,469	9,172*	2,770
YFE-2E	108	0	192**	8.4	1,534**	266	1,360*	286.6	14,114*	8,054
Mock	108	0	199	20	170.6	11.9	162	0	6,995	3,995
Clean	108	0	199	20	170.6	11.9	161	0.8	16,366	9,100
17DD	108	0	13,028	1,983	28,187	6,421	13,710	1,911	102,180	10,136

PRNT₅₀ = plaque-reduction neutralization test; SEM = standard error of the mean; YFE = yellow fever virus envelope protein.

^*P < 0.05 and **P < 0.01 when YFE-1, YFE-2E, and 17DD groups were compared (Kruskal–Wallis test).