A negative test for trachoma means that the individual does not have the disease. Trachoma is a chronic infectious disease of the conjunctiva of the eye surface, caused by Chlamydia trachomatis infection. The acute phase of trachoma can manifest as redness, swelling, tearing, increased discharge, and a foreign body sensation in the eyes. If not well-controlled, trachoma can become chronic over time. Due to damage to the corneal epithelium from trachoma, prolonged duration can lead to decreased vision and even blindness. Treatment of trachoma mainly involves the local and systemic use of antibiotics. Local medications primarily include 0.1% rifampicin, 0.5% tetracycline, and sulfonamide eye drops, while systemic medications may include oral doxycycline and other tetracyclines. The treatment course for trachoma is relatively long, generally requiring medication for at least six weeks or more. (Please follow medical advice from a doctor for specific medications.)