Table 2. Seroconversion rates according to virus concentration of vaccine against yellow fever.

Group IU/dose	Seroconversion1
	No	Yes	Total	Proportion	95% CI
27,476 IU	3	128	131	0.977	0.935; 0.995
10,447 IU	1	114	115	0.991	0.953; 1.000
3013 IU	3	129	132	0.977	0.935; 0.995
587 IU	4	127	131	0.969	0.924; 0.992
158 IU	14	108	122	0.885	0.815; 0.936
31 IU	39	79	118	0.669	0.577; 0.753

¹Seronegative before vaccination to seropositive or 4 fold increase in titers p = 0.000