Table 1.

Transmission by Pulex irritans infected using human blood and fed sterile human blood daily starting from day 1–2 after infection (group I)

Day post-infection	Total fleas	Fed flea number	Infection rate (%)	Mean CFU/flea	Blocked (B) fleas	Partially blocked (PB) fleas	B + PB fleas (%)	Total CFU transmitted	CFU transmitted per fed flea
Exp#1 (owl; Fig. 1A)
0	27	19	80	1.3 × 105	–	–	–	–	–
1	19	15	ND	ND	0	0	0	188	12.5
3	19	19	60	1.7 × 106	0	0	0	0	0
5	14	14	ND	ND	0	0	0	ND	ND
7	12	10	75	1.9 × 106	0	0	0	0	0
Exp #2 (owl; Fig. 1B)
0	29	16	100	3.9 × 104	–	–	–	–	–
1	15	13	ND	ND	0	0	0	0	0
3	15	15	60	1.9 × 106	0	0	0	0	0
5	11	9	91	2.5 × 106	0	0	0	0	0
Exp #3 (fox; Fig. 1C)
0	ND	60	100	5.5 × 104	–	–	–	–	–
2	59	49	ND	ND	0	0	0	ND	ND
5	43	40	ND	ND	0	0	0	0	0
9	34	24	ND	ND	0	0	0	13	0.5
13	18	15	ND	ND	0	0	0	0	0
16	12	10	75	4.6 × 106	0	0	0	0	0
Exp #4 (fox; Fig. 1D)
0	70	52	88	1.8 × 106	–	–	–	–	–
2	49	41	ND	ND	0	0	0	0	0
4	47	42	20	1.8 × 106	0	0	0	0	0
6	37	32	ND	ND	0	0	0	0	0
8	37	36	ND	ND	0	0	0	0	0
10	31	27	ND	ND	0	0	0	0	0
12	28	25	ND	ND	0	0	0	ND	ND
14	25	18	ND	ND	0	0	0	0	0
16	25	22	ND	ND	0	0	0	0	0
18	25	24	ND	ND	0	0	0	0	0
20	21	18	23	2.0 × 106	0	0	0	0	0

ND not determined. The source of the fleas used for the experiments (owl or fox) is indicated