**2.** *Chlamydia trachomatis* **eye infections**

#### **2.1 Conjunctivitis due to** *C. trachomatis*

*C. trachomatis* is divided into 15 serological subgroups (serovars) according to monoclonal antibody-based tests. These serovars are associated with many medical conditions such as:

**A, B, Ba, and C:** Trachoma is a serious eye disease that is endemic in certain regions of the world such as Asia and Africa, where close physical contact and poor hygiene conditions prevail. It is characterized by chronic follicular conjunctivitis and may cause visual damage.

**D, E, F, G, H, I, J, and K:** Sexual infections and neonatal infections due to eye contact with infected mother's cervix during the birth and adult eye infections in developed countries.

**L1, L2, L3:** Lymphogranuloma venereum (LGV), which correlates with genital ulcer disease in tropical areas.

*C. trachomatis* is spread by direct and indirect contact such as fomites, flies, bedding, towels, etc. Family and school are the main transmission environments for transmission. In healthy individuals, the immune system can cope with a single attack. However, in recurrent episodes of infection, it succumbs to the infection [13].
