Question

Kathy was scratched by her cat. after several days, several lesions appeared at the site of the scratch. she became worried and went to an urgent care center. The doctor suspected the infection was caused by a rod-shaped bacterium of class alphaproteobacteria. The bacterium only grows in the presence of oxygen. Katy's cat most likely acquired the infection when bitten by a contaminated rat flea. What is the cause of the zoonotic infection?

A. Bartonella quintana

B. Rickettsia typhi

C. Bartonella henselae

D. Rickettsia rickettsii

E. Yeresnia pestis

Answer 1

Ans:

C. Bartonella henselae

Explanation: Bartonella henselae is a rod-shaped gram negative, aerobic alphaproteobacteria that causes cat scratch disease. It is a infectious disease that develops by cat bite and the cat is contaminated by flea feces. Initially skin lesions are developed in the site of scratch and ultimately shows symptoms like typical fever, lymphadenopathy, and general malaise. Bartonella quintana is also a rod shaped gram negative alphaproteobacteria that causes trench fever. Yersnia pestis is the rod shaped gram negative anaerobic coccobacillus bacteria that causes plague disease. Rickettsia typhi and rickettsii are the gram negative coccobacillus aerobic alphaproteobacteria that causes murine typhus and rocky mountain spotted fever respectively.