A 45-year-old woman with a 3-month history of chronic follicular conjunctivitis, mild photophobia, and foreign body sensation is found to have positive Giemsa staining showing intracytoplasmic inclusions. Which is the most common cause of chronic follicular conjunctivitis in India?

Explanation

## Most Common Cause of Chronic Follicular Conjunctivitis in India **Key Point:** *Chlamydia trachomatis* (serovars D–K) is the most common cause of chronic follicular conjunctivitis worldwide and in India, accounting for approximately 50–70% of cases of chronic follicular conjunctivitis. ### Clinical Features of Chlamydial Conjunctivitis - Insidious onset, often unilateral initially - Chronic follicular reaction (follicles on tarsal conjunctiva) - Mild photophobia and foreign body sensation - Mucopurulent discharge (may be minimal) - Duration: weeks to months if untreated - Associated with urogenital infection in sexually active individuals ### Diagnostic Findings | Feature | Chlamydial | Viral | Bacterial | |---------|-----------|-------|----------| | **Giemsa stain** | Intracytoplasmic inclusions (RBs) | Negative | Negative | | **PCR/NAAT** | Positive | Negative | Negative | | **Follicles** | Prominent on tarsal plate | Follicles + papillae | Minimal | | **Duration** | Weeks to months | 1–2 weeks (viral) | 1–2 weeks | | **Discharge** | Mucopurulent (mild) | Watery/mucoid | Purulent | **High-Yield:** The presence of **intracytoplasmic inclusions on Giemsa staining** is pathognomonic for *Chlamydia trachomatis*. This is a high-yield diagnostic feature for NEET PG. ### Serovars and Clinical Significance - **Serovars A, B, Ba, C:** Trachoma (endemic keratoconjunctivitis) - **Serovars D–K:** Non-gonococcal urethritis (NGU) and inclusion conjunctivitis - **Serovars L1, L2, L3:** Lymphogranuloma venereum (LGV) ### Management - Topical tetracycline ointment (1%) or erythromycin (0.5%) — 4–6 weeks - Systemic doxycycline 100 mg BD × 3 weeks (preferred for serovars D–K) - Azithromycin 1 g single dose (alternative) - Partner screening and treatment essential **Clinical Pearl:** Chronic chlamydial conjunctivitis in an adult should raise suspicion for concurrent urogenital infection; sexual partners must be screened and treated to prevent reinfection.