From: Transmission efficiency of the plague pathogen (Y. pestis) by the flea, Xenopsylla skrjabini, to mice and great gerbils
Group
Gerbil number
Flea per gerbil
Positive gerbil
Days to develop disease in gerbils**
Positive rate (%)
1
9
10
4
4, 5, 5, 5
44.4
2
30
6, 7, 7, 7
40.0
3
7
60
5
4, 4, 4, 5, 6
71.4
Total
26
/
13
50%