Fig. 4From: Poor vector competence of the human flea, Pulex irritans, to transmit Yersinia pestisP. irritans fleas infected using rat blood and fed sterile rat blood every 2 to 3 days. The results of five independent experiments are shown in (A–E); see Fig. 1 legend for details. Grey bars indicate the number of partially blocked fleas and black bars the number of completely blocked fleas diagnosed immediately after feedingBack to article page