Rebecca was scratched by her cat and noticed redness and several swollen lesions appeared at the site of infection. She became concerned as her headache, fever and pain persisted, and went to an urgent care center. The doctor examined Rebecca and detected several buboes at the site of infection. The doctor sent a blood sample to the laboratory. The blood test showed the presence of antibodies involved in fighting the infection. It was suspected the bacterium was a parasitic obligate aerobic, rod of class Alphaproteobacteria. Gram stain showed pink bacilli and acid fast stain showed blue bacilli. Her infection was most likely acquired from a contaminated rat flea that contaminated her cat. The doctor prescribed azithromycin to Rebecca for her infection. What is the cause of the zoonotic infection