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)
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 (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 | |