Table 1. O. montana transmission data summary.

Days P.I.a	No. fleas fed	% Infected	CFU/fleab	No. fleas blocked	No. fleas partially blocked	CFU transmittedc
	Experiment 1 (1.9 x 108 CFU/ml)d
0	-	100	3.7 x 104 ±2.9 x 104	-	-	-
3	173	65	3.1 x 105 ±5.3 x 105	0	2	0
10	177	67	2.8 x 105 ±2.9 x 105	23	16	210,000
17	176	50	4.6 x 105 ±4.1 x 105	8	3	54,000
24	100	47	4.5 x 105 ±3.3 x 105	3	1	1,900
31	44	21	2.8 x 105 ±1.1 x 105	0	0	0
	Experiment 2 (4.0 x 108 CFU/ml)d
0	-	100	2.4 x 105 ±2.1 x 105	-	-	-
3	136	35	2.1 x 105 ±2.2x 105	0	4	0
10	175	60	2.4 x 105 ±4.9 x 105	9	24	110,250
17	144	80	3.3 x 105 ±5.9 x 105	12	3	130,000
24	156	50	2.3 x 105 ±2.9 x 105	18	10	42,625
31	160	70	4.4 x 105 ±3.0 x 105	6	7	27,900
	Experiment 3 (1.4 x 109 CFU/ml)d
0	-	100	2.9 x 105 ±2.0 x 105	-	-	-
3	202	40	1.8 x 105 ±2.3 x 105	0	3	7
10	188	65	6.0 x 105 ±7.1 x 105	20	20	418,900
17	195	90	5.0 x 105 ±4.1 x 105	14	17	392,700
24	136	80	4.6 x 105 ±4.7 x 105	3	9	76,800
31	177	80	5.3 x 105 ±2.7 x 105	7	5	403,600

^aDays after the infectious blood meal. Day 0 indicates the day of infection; data for this day are included to show the initial infectious dose (no transmission test was done).

^bMean ± SD in infected fleas.

^cData used for Fig 4A.

^dConc. of Y. pestis in infectious blood meal on day 0.