Chlamydia trachomatis causes which of the following conditions?

• A. Rat-bite fever
• B. Inclusion conjunctivitis
• C. A skin disease found predominantly in tropical areas
• D. Zoonosis in birds and parrot fever in humans

Answer: (B)

Chlamydia trachomatis is known for causing inclusion conjunctivitis, an eye infection marked by mucopurulent discharge and follicles on the conjunctiva. This organism is an intracellular bacterium that can be transmitted to newborns during delivery or acquired later through sexual contact, leading to conjunctivitis with characteristic inclusion bodies in conjunctival cells. The other options reflect diseases caused by different pathogens: rat-bite fever is due to bacteria like Streptobacillus moniliformis, a tropical skin disease involves other organisms, and parrot fever (psittacosis) is caused by Chlamydophila psittaci. So inclusion conjunctivitis is the condition linked to Chlamydia trachomatis in this context.