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Title: Potential role for mucosal IgA in modulating Haemonchus contortus adult worm infection in sheep
Authors: Hernández Vega, Julia Natividad 
Rodríguez Hernández, Ángel 
Stear, M. J. 
Conde-Felipe, M. 
Rodríguez, E. 
Piedrafita, D. 
González, J. F. 
UNESCO Clasification: 310907 Patología
240112 Parasitología animal
Keywords: Canaria hair breed
Canaria sheep
Haemonchus contortus
Sheep-nematoda, et al
Issue Date: 2016
Journal: Veterinary Parasitology 
Abstract: Haemonchus contortus (H. contortus) is a haematophagous parasite which causes important economic losses in small ruminants. On the island of Gran Canaria, two sheep breeds coexist which differ in their susceptibility to the infection with H. contortus; the resistant Canaria Hair Breed (CHB) sheep and the susceptible Canaria Sheep (CS) breed. The major target of resistance mechanisms in CHB sheep are directed to the adult parasite stage, reducing the worm burden, and decreased length and fecundity of surviving worms. Mucosal IgA (mIgA) has been shown to be an important regulator of immunity in Haemonchus and Teladorsagia infections; through correlations with larval stages where such mechanisms as antibody-dependent cell cytotoxicity and enzyme inhibition may mediate resistance. Here for the first time, we demonstrate a significant negative correlation between mIgA and adult worm length and fecundity only in the resistant CHB sheep. In contrast, and as reported in other sheep breeds, mIgA was only negatively correlated against the larval stage in the more susceptible CS breed. This study suggests mIgA may play a role in resistance to both larval and adult stages.
ISSN: 0304-4017
DOI: 10.1016/j.vetpar.2016.04.022
Source: Veterinary Parasitology[ISSN 0304-4017],v. 223, p. 153-158
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