Five years of post-validation surveillance of lymphatic filariasis in Thailand.

Background: The World Health Organization (WHO) validated Thailand in 2017 as having eliminated lymphatic filariasis (LF) as a public health problem with recommendations for continued surveillance. This article describes measures and progress made in Thailand with post-validation surveillance (PVS) of LF from 2018 until 2022.

Methods: The implementation unit (IU) is a sub-village in 11 former LF endemic provinces.