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Cholera toxin B stimulates systemic neutralizing antibodies after intranasal co-immunization with measles virus

¹ Laboratoire National de Santé, PO Box 1102, L-1011 Luxembourg, the Grand-Duchy of Luxembourg,
² Medical Faculty, University of Tübingen, Germany
³ Institut Pasteur de Lyon, France
and⁴ Institute of Organic Chemistry, University of Tübingen, Germany

An efficient mucosal vaccination has a number of obvious advantages over invasive routes of immunization. The immune response to measles virus (MV) was investigated after intranasal and intragastric coimmunization of mice with cholera toxin B (CTB) as an adjuvant. High titres of virus-specific IgG antibodies and a transient IgA response were detected in the sera after intranasal but not after intragastric immunization when CTB was used. In the presence of CTB, higher titres were reached with less antigen and fewer intranasal boosts. Neutralizing antibodies were found in all animals only after co-immunization with MV and CTB. In the nasal wash and the saliva, IgG and IgA titres were significant only in the MV plus CTB groups; IgG levels were comparable to those found after intraperitoneal (i.p.) immunization with complete Freund's adjuvant. Specific IgA was detected in the mucosal fluids only after intranasal immunization with MV plus CTB but not after i.p. or intragastric immunization. The antibody response consisted of 99% IgG1 after MV immunization. In the CTB groups 10% IgG2b and 1% IgG2a were detected in addition to the predominant IgG1 antibodies.

^* Author for correspondence. Fax +352 404238. e-mail claude.muller@santel.lu

Received 7 October 1994; accepted 12 January 1995.

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