Passive immunization of immune-suppressed animals: Chicken antibodies protect against Ornithobacterium rhinotracheale infection
Unravelling of the protective immunity acquired during a natural infection may contribute to vaccine development. To assess the role of antibody-mediated immunity in protection against Ornithobacterium rhinotracheale infection in chickens, a novel experimental method was applied that combined immune...
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Published in | Vaccine Vol. 23; no. 26; pp. 3404 - 3411 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
16.05.2005
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Unravelling of the protective immunity acquired during a natural infection may contribute to vaccine development. To assess the role of antibody-mediated immunity in protection against
Ornithobacterium rhinotracheale infection in chickens, a novel experimental method was applied that combined immune depletion and passive transfer of immunity within the same host. Administration of cyclophosphamide (CY) to broiler chickens successfully suppressed B lymphocyte development, and therefore humoral immunity, as confirmed by histological and serological analysis. Challenge of CY-treated birds with
O. rhinotracheale revealed a significantly higher pathology score in comparison to immune-competent birds that received the same bacterial challenge. Measurement of serum immunoglobulin levels of immune-competent birds revealed a positive correlation between IgA and/or IgG production and protection against infection. Passive transfer of
O. rhinotracheale-specific antiserum to the immune-suppressed birds prior to pathogen challenge significantly decreased morbidity. This protective effect was not observed after administration of control sera containing similar concentrations of immunoglobulins. Together, these results provide firm evidence that chicken humoral immunity to
O. rhinotracheale is a key component in protection against infection. Our data confirm that the applied immune depletion and reconstitution approach is an attractive tool to analyse the nature of the protective immune response. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 0264-410X 1873-2518 |
DOI: | 10.1016/j.vaccine.2005.01.095 |