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A cohort study on anti-filarial IgG4 and its assessment in good and uncertain MDA-compliant subjects in brugian filariasis endemic areas in southern Thailand

Published online by Cambridge University Press:  08 May 2009

C. Jiraamonnimit ,
S. Wongkamchai ,
J. Boitano ,
H. Nochot ,
S. Loymek ,
S. Chujun  and
S. Yodmek
C. Jiraamonnimit
Affiliation:
Filaria Division, Ministry of Public Health, Nonthaburi Province, Thailand
S. Wongkamchai*
Affiliation:
Department of Parasitology, Faculty of Medicine Siriraj Hospital, Bangkok, Thailand
J. Boitano
Affiliation:
Department of Parasitology, Faculty of Medicine Siriraj Hospital, Bangkok, Thailand
H. Nochot
Affiliation:
Department of Parasitology, Faculty of Medicine Siriraj Hospital, Bangkok, Thailand
S. Loymek
Affiliation:
Filaria Project, Phikulthong Royal Development Study Center, Narathiwatt Province, Thailand
S. Chujun
Affiliation:
Vector Borne Disease Control Center No. 11.2, Nakorn Srithammarat Province, Thailand
S. Yodmek
Affiliation:
Vector Borne Disease Control Center No. 11.3, Surathani Province, Thailand
*
*Fax: +66-02-4112084 E-mail: siswk@mahidol.ac.th
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Abstract

The prevalence of Brugia malayi was surveyed in three highly endemic provinces in southern Thailand as part of an ongoing evaluation of the effectiveness of two rounds of mass drug administration (MDA). Prior to MDA IV, and thereafter every 6 months up to 18 months, including MDA V at 12 months, nocturnal blood sampling was assayed for microfilaria (mf) and IgG4 antibodies in 200 subjects from Nakorn Srithammarat and Surathani provinces. From an additional 300 subjects from Narathiwatt province, daytime blood was also examined for IgG4 antibodies for 1 year. Subjects who tested positive, with reciprocal IgG4 titres above 100, were dichotomized in the ‘good compliant’ or ‘uncertain compliant’ groups. Stool samples were examined for intestinal parasites from all 500 subjects simultaneously. Only two subjects (1%) tested positive for mf, while 98 subjects (19.6% of 500) tested positive for IgG4. In general, the good drug-compliant subjects were less likely to exhibit the IgG4 response than subjects in the uncertain compliant group. Only six subjects (1.2%) exhibited lymphoedema while 68 subjects (13.6%) had a total of 105 parasitic infections, with female instances of protozoan infections exceeding male instances of helminth infections. It was concluded that the two MDA rounds were highly successful in not only in reducing mf to negligible levels but also in lowering antifilarial IgG4 titres in the good compliant subjects. The IgG4 assay is a sensitive and cost-effective surveillance tool for the early detection of brugian infections that is not contingent on nocturnal blood collections.

Type
Research Papers
Information
Journal of Helminthology , Volume 83 , Issue 4 , December 2009 , pp. 351 - 360
Copyright
Copyright © Cambridge University Press 2009

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