Table 2 Transmission by Pulex irritans infected using human blood and subsequently fed sterile human blood every 2 days (group II)
From: Poor vector competence of the human flea, Pulex irritans, to transmit Yersinia pestis
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 (fox; Fig. 2A) | |||||||||
0 | 292 | 119 | 85 | 1.8 × 105 | – | – | – | – | – |
2 | 126 | 105 | 90 | 7.6 × 105 | 0 | 0 | 0 | 0 | 0 |
4 | 108 | 80 | ND | ND | 0 | 0 | 0 | 0 | 0 |
6 | 94 | 71 | ND | ND | 0 | 0 | 0 | 0 | 0 |
8 | 84 | 66 | 80 | 9.5 × 105 | 0 | 0 | 0 | 0 | 0 |
10 | 57 | 41 | ND | ND | 0 | 0 | 0 | 0 | 0 |
12 | 62 | 40 | ND | ND | 0 | 0 | 0 | 0 | 0 |
14 | 47 | 46 | ND | ND | 0 | 0 | 0 | 0 | 0 |
16 | 44 | 43 | ND | ND | 0 | 0 | 0 | 0 | 0 |
18 | 39 | 36 | ND | ND | 0 | 0 | 0 | 0 | 0 |
20 | 37 | 22 | ND | ND | 0 | 0 | 0 | 0 | 0 |
22 | 31 | 25 | ND | ND | 0 | 0 | 0 | 0 | 0 |
24 | 27 | 25 | ND | ND | 0 | 0 | 0 | 8 | 0.3 |
26 | 20 | 16 | 50 | 2.0 × 106 | 0 | 0 | 0 | 0 | 0 |
Exp #2 (owl; Fig. 2B) | |||||||||
0 | 21 | 12 | 100 | 1.4 × 106 | – | – | – | – | – |
2 | 12 | 7 | ND | ND | 0 | 0 | 0 | 0 | 0 |
4 | 12 | 11 | 50 | 1.7 × 106 | 0 | 0 | 0 | 0 | 0 |
6 | 6 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |