A regional programme to combat lymphatic filariasis in the Pacific islands is showing great promise as it reaches its halfway point. The Pacific Programme to Eliminate Lymphatic Filariasis (PacELF), established in 1999, aims to eliminate the disease from the Pacific by 2010 - ten years ahead of the global target. Set up with support from Australia, and now funded primarily by Japan and underpinned by the Word Health Organization, PacELF is providing evidence that Pacific nations can work cooperatively to rid the region of one of its worst scourges, in addition to discovering techniques and new tools that should be of use in other regions.