Prevalence of .... % is considered as an epidemic of trachoma and indication for staing chemoprophylaxis.

Prevalence of 10 % is considered as an epidemic of trachoma and indication for staing chemoprophylaxis * Annual mass drug administration (MDA) with azithromycin (or topical tetracycline) for three years, was recommended by WHO, in combination with other elements of the SAFE strategy, in districts where the prevalence of TF in children aged 1-9 years, determined by programmes using population-based surveys, was at least 10%. * Number of rounds of treatment required: if baseline prevalence is over 30% - 5 rounds of treatment are recommended. If baseline prevalence is between 10% and 30% - 3 rounds of treatment should be conducted. * Prevalence of 10 % is considered as an epidemic of trachoma and indication for staing chemoprophylaxis