Question

4) Which of the following is NOT an obligate intracellular parasite?

a) Rickettsia rickettsii

b) Chlamydia trachomatis

c) Coxiella burnetii

d) Treponema pallidum

Answer 1

Option d that is Treponema pallidum is not an obligate intracellular parasite.

Treponema pallidum is a spirochaeta bacterium with subspecies that cause the disease syphilis,bejel,and uses.It is a helically coiled microorganism usually 6-15 m long and 0.1-0.2 m wide.

Rickettsia rickettsii , Chlamydia trachomatis ,Coxiella burnetii all are Obligate intracellular parasite. They cannot reproduce outside their host cell,meaning that the parasites reproduction is entirely reliant on intracellular resources.