Question

Indian tick typhus is caused by which organism?

• A. R. typhi
• B. R. conorii
• C. R. akari
• D. C. burnetii

Hint:

It is a tick borne spotted fever group rickettsia spread by the dog tick.

Answer 1

The Correct Option is B

Step 1: Match the disease name to its rickettsial group. The word tick points to the spotted fever group rather than the typhus group.

Step 2: Within the spotted fever group, R. conorii is the species responsible for Indian tick typhus and Mediterranean spotted fever, with the dog tick acting as vector.

Step 3: Eliminate the distractors by their vectors and groups. R. typhi is flea transmitted murine typhus, R. akari is mite transmitted rickettsialpox, and C. burnetii is the Q fever organism spread mainly by aerosols.

Step 4: The only tick borne spotted fever agent in the list is R. conorii.

\[\boxed{\text{R. conorii}}\]