How Thailand eliminated lymphatic filariasis as a public health problem

Table 5 Stop mass drug administration (MDA) surveys

Antigen detection	Filarial parasite	Number of provinces	Total number of IUs	Number of IUs surveyed	Test used	Result
Stop MDA survey, 2006
> 6 years of age	Wuchereria bancrofti	5	206	20	ICT	206 IUs: 0%
		2	54	26	mf	1 IU: > 2.7%
	Brugia malayi	4	97	25	mf	7 IUs: 0.3% ^a
≤ 6 years of age	W. bancrofti	7	260	232	ICT	0%
≤ 6 years of age	B. malayi	4	97	24	mf	0%
Stop MDA survey – Narathiwat province, 2011
≤ 6 years of age	B. malayi	1	87	87	ELISA^b	71 IUs: 0% 3 IUs: < 2%^c 13 IUs: > 2%^c

ICT Immunochromatographic test, IUs Intervention units, Mf Microfilaria
^a Out of 25 IUs, 15 IUs surveyed were in Narathiwat province. Nine mf positive cases were detected in seven IUs in Narathiwat province with, highest mf prevalence of 0.8% (0.1–0.8%)
^bFilariaDIAG RAPID (an ELISA IgG4test developed jointly by Mahidol and Chiang Mai hospital, Thailand). In Brugia endemic provinces, antibody assessment was introduced as soon as Brugia rapid test were available for the programme
^c Antibodies detected in 16 IUs among 26 children [Antibody rate: 33.3% (11.0–33.3%) who were subsequently tested for mf of whom seven were positive [mf positivity rate: 4.2% (0.4–4.2%). ELISA test was used during the day time for children. Positive ELISA cases were subsequently tested for mf during the night

ISSN: 2049-9957