The billionth treatment was administered on Thursday 16 November to a seven-year-old girl named Dorcas, who was at risk of NTDs in Kaduna State, Nigeria.
Trachoma is easily transmitted from person to person, so good hygiene is vital to prevent the disease spreading.
Two more areas and more than a million people in the country have met the World Health Organization criteria for elimination of the disease.
Sightsavers is trialling an alternative strategy: rather than treating entire populations, the aim is to test residents first to see if they have the disease.
Dr Caroline Harper visited Tanzania and Uganda this week to highlight the advances being made to eliminate blinding trachoma.
Dr Sunday Isiyaku will lead the non-governmental development organisation coalition for neglected tropical diseases and eye health in Nigeria.
Sightsavers has been awarded a $300,000 grant from the Foundation for its work in Liberia to eliminate river blindness and lymphatic filariasis.