Bacterial loads at injection site and in draining lymph node.

<p>Data are means of log₁₀ of cfu numbers recovered from 77 mice infected over six independent experiments. Bars = Standard Errors. Stars indicate that the data are significantly different between the two <i>Yersinia</i> species (p≤0.0001). The dashed line shows the detection limit (10 cfu). The cross symbol indicates that most <i>Y. pestis</i>-infected mice died between days 2 and 3.