Multiple choice

The causative agent of typhus fever belongs to the category of

  1. spirochaetes

  2. actinomycetes

  3. rickettsia

  4. mycoplasma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

These are a group of coccoid or rod shaped bacteria much smaller than other classical bacteria. They are non-motile and reproduce by fission. Most of them are obligate parasites. Some familiar examples are Rickettsia prowazeki which causes typhus fever.

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