Situation and trends
As of 2016, preventive chemotherapy (PC) to eliminate the transmission of LF infection was considered required in 53 out of 72 endemic countries. Due to the tremendous efforts of national programmes, more than 6.7 billion treatments have been delivered worldwide in 64 countries since the Global Programme to Eliminate Lymphatic Filariasis (GPELF) was launched in 2000. Twenty countries have reduced infection prevalence to levels at which transmission is assumed not to be sustainable. Nine of these countries have now been acknowledged as achieving the elimination of LF as a public health problem.
The total population in all implementation units (IUs) in a given country with evidence of more than 1% infection prevalence is considered to require PC. Globally, in 2016 the total population of such IUs is 856.4 million and declining as more and more IUs undergo and successfully pass the WHO recommended Transmission Assessment Survey (TAS).
This site displays the most recent data reported to WHO since the inception of GPELF.