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Table 5 Comparison of single flea transmission to mice between artificially infected fleas and naturally infected ones

From: Transmission efficiency of the plague pathogen (Y. pestis) by the flea, Xenopsylla skrjabini, to mice and great gerbils

  Artificially infected fleas Naturally infected fleas
Group Infective Non-infective Total Infective Non-infective Total
Number of fleas 6 15 21 4 8 12
Number of mice bit 82 180 262 50 106 156
Number of mice infected 7 0 7 22 0 22
Mice infection rate 8.54% - 2.67% 44.00% - 14.10%
Average flea life (days) 14.67 ± 3.88 13.0 ± 3.88 13.5 ± 4.07 15.5 ± 1.83 16.0 ± 2.72 15.83 ± 1.73
Days of infection* 7, 9, 11, 13(3), 18 7(3), 8(4), 9(2), 10(3), 11(2), 12(3), 13(2),15(2), 16(1)
  1. *Days post of the initial infection of fleas, and the number in the bracket indicating how many mice got infected on that day. 13(3): on day 13 post of flea infection, three mice bit by the fleas get infected (confirmed later depends on the progress of the infection).