Skip to main content
Research article - Peer-reviewed, 2007

Hepatic changes in congenital Schistosoma japonicum infections in pigs

Iburg T, Johansen MV, Leifsson PS, Willingham AL, Lindberg R


The inflammatory response in liver tissue from piglets congenitally infected with Schistosoma japonicum was examined at two different timepoints after infection. The piglets, which were the offspring of three sows infected with 9000 S. japonicum cercariae in the 10th week of gestation, were allocated into two groups (n = 9 and 17) killed 5 or 11 weeks after birth, respectively. All piglets developed a low level infection,with no significant difference between the groups. Inflammatory lesions in the liver consisted mainly of granulomas in portal areas, often obliterating the portal veins, and frequently with central eggs or egg remnants. The granulomatous reaction consisted of epithelioid cells and occasional giant cells surrounded by layers of lymphocytes, eosinophils, plasma cells, and various amounts of collagen and fibroblasts. Mild to moderate infiltration of portal and septal connective tissue with eosinophils and lymphocytes was common, but the connective tissue was generally not increased. At the two timepoints, slight differences were observed in the numbers of eosinophils and lymphocytes in the granulomas and in the size of the granulomatous reaction. The same pattern of immunohistochemical labelling was seen in both groups. CD79 alpha(+) B cells were scarce except in granuloma-associated lymphold follicles;the majority of lymphocytes in granulomas and at other sites were CD3 epsilon(+) Tcells. The granulomatous reaction in the livers of piglets to schistosoma eggs from prenatal S. japonicum infection was similar to that seen in postnatal infection. Signs of immunomodulation of granulomas between the two timepoints of infection were not demonstrable. (C) 2007 Elsevier Ltd. All rights reserved

Published in

Journal of Comparative Pathology
2007, Volume: 136, number: 4, pages: 250-255

    SLU Authors

    UKÄ Subject classification

    Animal and Dairy Science
    Veterinary Science

    Publication Identifiers


    Permanent link to this page (URI)