Fig. 1

The background map shows the location of Matotagama village (circle) in Matara district, Sri Lanka. The inset map on the left shows households included in the survey. Red dots indicate households with one or more residents with positive Filariasis Test Strip (FTS) results where all residents had negative Card Tests. Blue dots show households with residents who were positive for circulating filarial antigenemia (CFA) by FTS and the Card Test. Green dots show houses with no positive CFA test results. All persons in this study site with positive Card Test results were also positive by FTS