Conjunctivitis — Acute and Chronic

Which clinical sign is most characteristic of chlamydial trachomatis conjunctivitis in adults?

A 52-year-old man with a 6-month history of chronic bilateral conjunctival redness, mild foreign body sensation, and stringy mucoid discharge presents to the ophthalmology clinic. He denies photophobia or pain. On examination, he has mild papillary reaction on the upper tarsal conjunctiva, no follicles, and no lymphadenopathy. Schirmer test is 8 mm at 5 minutes. What is the most likely diagnosis?

A 28-year-old woman presents with a 3-day history of bilateral eye redness, watery discharge, and mild photophobia. She reports recent upper respiratory tract infection. On examination, she has diffuse conjunctival injection, follicular reaction on the tarsal conjunctiva, and preauricular lymphadenopathy. Corneal involvement shows fine punctate epithelial keratitis. What is the most likely causative organism?

The clinical image shown above demonstrates an eye with marked redness, significant conjunctival swelling, and abundant yellowish discharge. What is the most likely diagnosis?

A 35-year-old man with a 6-month history of chronic bilateral follicular conjunctivitis and mild keratitis presents with conjunctival scarring and trichiasis. Chlamydia trachomatis (serovars A–C) is confirmed on PCR. What is the drug of choice for treatment?