Table 1.

Vaccine treatments administered to A/J mice via intramuscular inoculation and their response to challenge with Yersinia pestis (CO92) at various days post booster vaccination (dpb) at a dosage of 1.4 × 10⁴ mouse LD₅₀s. Risk ratios are calculated in relation to RCN-F1/V307 at day 56 dpb. Lower and upper 95% indicate 95% confidence intervals on the risk ratio.

Treatment	DPB	% Survival	Risk Ratio	Prob > Chisq	Lower 95%	Upper 95%
Control	7	0	9.04	0.01	1.71	66.63
	14	0	4.15	0.09	0.80	30.34
	28	0	7.27	0.02	1.39	53.13
	56	0	4.31	0.08	0.84	31.24
RCN-F1	7	33	2.70	0.24	0.53	19.47
	14	50	1.56	0.62	0.26	11.83
	28	67	0.85	0.87	0.10	7.08
	56	50	1.46	0.67	0.24	11.11
RCN-V307	7	33	2.52	0.27	0.49	18.24
	14	17	2.88	0.18	0.61	20.23
	28	17	4.70	0.05	1.00	33.00
	56	0	5.90	0.02	1.33	40.88
RCN-F1 + RCN-V307	7	33	1.88	0.45	0.37	13.58
	14	100	0.00	0.06	0.00	1.15
	28	100	0.00	0.06	0.00	1.15
	56	33	1.87	0.46	0.37	13.50
RCN-F1/V307	7	17	3.78	0.09	0.81	26.48
	14	50	1.53	0.64	0.25	11.59
	28	67	0.80	0.82	0.10	6.67
	56	67	1.00