Rickettsia and Chlamydia
Which of the following describes the difference between mycoplasmas and chlamydiae?
|A||Able to cause disease in humans|
|B||Able to cause urinary tract infection|
|C||Able to grow on artificial cell-free media|
|D||Able to stain well with Gram stain|
a. Mycoplasmas lack a rigid cell wall and are bound by a triple-layer unit membrane. For this reason, they are completely resistant to the action of penicillins. Unlike the chlamydiae, they can replicate in cell-free media.
b. Chlamydia are cultivable only on yolk sac of chick embryo or on cell lines-HeLa, McCoy which are irradiated.