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Setaria digitata infections in cattle: parasite load, microfilaraemia status and relationship to immune response

Published online by Cambridge University Press:  22 February 2007

M.C. Mohanty
Affiliation:
Division of Immunology, Regional Medical Research Centre (ICMR), Chandrasekharpur, Bhubaneswar 751 016, Orissa, India
P.K. Sahoo
Affiliation:
Division of Immunology, Regional Medical Research Centre (ICMR), Chandrasekharpur, Bhubaneswar 751 016, Orissa, India
A.K. Satapathy
Affiliation:
Division of Immunology, Regional Medical Research Centre (ICMR), Chandrasekharpur, Bhubaneswar 751 016, Orissa, India
B. Ravindran*
Affiliation:
Division of Immunology, Regional Medical Research Centre (ICMR), Chandrasekharpur, Bhubaneswar 751 016, Orissa, India
*
*Author for correspondence Fax: 91-674-440974 E-mail: immunol@dte.vsnl.net.in

Abstract

A total of 110 cattle were examined in an area endemic for Bancroftian filariasis for the prevalence of infection of the bovine filarial parasite Setaria digitata. About 12.5% of cattle were found to harbour both adult worms in the peritoneum and microfilariae (mf) in circulation; 70% of the cattle were amicrofilaraemic but with an adult worm infection. A third group of cattle (16.5%) was free of detectable mf and adult worms. The presence of adult worms and/or mf did not influence the antibody levels to any of the four antigen preparations of S. digitata. However, there was a significant inverse relationship between the presence of antibodies to microfilarial sheaths and the absence of circulating mf as shown by the immunoperoxidase assay. Cattle immunoglobulin containing high titres of anti-sheath antibodies cleared circulating microfilariae very effectively in Mastomys coucha thus demonstrating the protective nature of anti-sheath antibodies in eliminating circulating microfilariae in vivo.

Type
Research Article
Copyright
Cambridge University Press 2000

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