Trachoma in the Sudan. A laboratory study.

Area of Science:

• Ophthalmology
• Microbiology
• Virology

Background:

• Trachoma is a leading cause of preventable blindness worldwide.
• The causative agent of trachoma requires specific laboratory conditions for isolation and study.

Purpose of the Study:

• To isolate and characterize strains of the trachoma agent from clinically diagnosed patients in Sudan.
• To investigate the susceptibility of chick embryos to the trachoma agent under different passaging conditions.

Main Methods:

• Clinical diagnosis of trachoma in 46 patients in Sudan.
• Isolation of the trachoma agent from patient samples.
• Bacterial contamination control using streptomycin and vancomycin.
• Repeated passaging of the trachoma agent in chick embryos.

Main Results:

• 25 strains of the trachoma agent were successfully isolated from the patients.
• Bacterial contamination during isolation was effectively managed with streptomycin and vancomycin.
• Chick embryos demonstrated a seasonal decrease in susceptibility to the trachoma agent upon repeated passaging, particularly during summer months.

Conclusions:

• Successful isolation of multiple trachoma agent strains from a Sudanese cohort is reported.
• The efficacy of specific antibiotics in controlling bacterial contamination during isolation was confirmed.
• Seasonal variations in chick embryo susceptibility present a challenge for consistent experimental studies of the trachoma agent.