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Characterization of the Local and Systemic Virus Neutralizing Activity in Swine Vaccinated with a Porcine Enterovirus

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Journal Can J Comp Med
Date 1977 Jul 1
PMID 198074
Citations 3
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Abstract

The virus neutralizing substance in the gastrointestinal tract of swine vaccinated in different ways with porcine enterovirus strain T80 was characterized by tests for enhancement and absorption of virus neutralizing activity by class specific antiporcine Ig antisera. The gastrointestinal virus neutralizing activity of piglets which were vaccinated with live virus orally resided predominantly in the IgA class, although some activity was present also in the IgM and IgG classes. The serum virus neutralizing activity of this group was present in all three classes but primarily in the IgG class. The IgA in the serum of this group was presumably of gut origin. However, in piglets vaccinated with live virus intramuscularly, with formaldehyde-inactivated virus orally or intramuscularly or with ethylenimine-inactivated virus by both oral and subcutaneous routes, both serum and gastrointestinal virus neutralizing activity were attributable predominantly to antibodies of the IgG and IgM classes. None possessed serum IgA. There was evidence also for the presence of Ig fragments in some gastrointestinal extracts.

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