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Table 6 Transmission Assessment Surveys (TAS) 2012–2017: Coverage and results

From: How Thailand eliminated lymphatic filariasis as a public health problem

Year Number of provinces Number of EUs Number of IUs Number of children tested Speciesa/Test Number children positive for antigen or antibody b/ critical cut off value Number of mf positive children c Contact survey result
2012– 10 EU-1 260 1786 WB/Ag 0 /11 0
2013 (TAS-1)   EU-2 10 129 BM/Ab 1 / 2 0
   EU-3 87 1018 BM/Ab 7/16 2 Negative
2015 (TAS-2) 1 EU-3.1 18 284 BM/Ab 2 / 3 0
  EU-3.2 32 506 BM/Ab 3 / 6 0
EU-3.3 37 506 BM/Ab 6 / 6 2 Negative
2016–2017 (TAS-3) 11 EU-1 260 2233 WB/Ag d 0 /11 0
EU-2 10 144 BM/Ab 0 / 2 0
   EU-3.1 18 284 BM/Ab 0 / 3 0
EU-3.2 32 506 BM/Ab 0 / 6 0
EU-3.3 37 530 BM/Ab 4 / 6 3 Negative
  1. EUs Evaluation units; IUs: Intervention units
  2. a WB: Wuchereria bancrofti; BM: Brugia malayi
  3. b Antigen (Ag) with immunochromatographic test (ICT); Antibody (Ab) with Brugia Rapid test
  4. c Among Ag or Ab positive children
  5. d Filaria Test Strip (FTS) was used instead of ICT