Fig. 1

Splenic enlargement in a Brucella-infected mouse compared with a normal mouse and countable Brucella colonies in 0.1 g spleen homogenate from mice in the following groups inoculated on TSA plates. a health control mouse spleen, b pretreatment, c non-treatment, d doxycycline only, e combination of antibiotic and root extract, f C. mongolica root extract only