Situation and trends
As of 2015, preventive chemotherapy (PC) to eliminate the transmission of LF infection was considered required in 55 out of 73 endemic countries. Due to the tremendous efforts of national programmes, more than 6.2 billion treatments have been delivered worldwide in 63 countries since the Global Programme to Eliminate Lymphatic Filariasis (GPELF) was launched in 2000. Eighteen countries have reduced infection prevalence to levels at which transmission is assumed not to be sustainable. Six 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, the total population of such IUs is 945.5 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.