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Unité de Pathologie Infectieuse et Immunologie, INRA Centre de Tours, 37380 Nouzilly, France
Correspondence Olivier Grépinet grepinet{at}tours.inra.fr
Received 5 June 2002 Accepted 21 August 2002
The protective effect of DNA vaccination with the gene encoding the major outer-membrane protein (MOMP) of Chlamydophila abortus has been studied in non-pregnant and pregnant mouse models after chlamydial challenge. OF1 outbred mice were vaccinated intramuscularly three times every 3 weeks, mated and challenged with C. abortus 2 weeks after the last injection of DNA. In non-pregnant mice, the MOMP DNA vaccine elicited a specific humoral response with predominantly IgG2a antibodies, suggesting a Th1-type immune response. The induced antibodies showed no in vitro neutralizing effect on C. abortus infectivity. Moreover, immunization with the momp gene showed no reduction in the mean splenic bacterial counts of non-pregnant or pregnant mice or in the mean placental bacterial counts of pregnant mice after the C. abortus challenge. Nevertheless, the MOMP DNA immunization induced a non-specific and partial protection in fetuses against challenge.
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C. Hechard, O. Grepinet, and A. Rodolakis Molecular cloning of the Chlamydophila abortus groEL gene and evaluation of its protective efficacy in a murine model by genetic vaccination J. Med. Microbiol., September 1, 2004; 53(9): 861 - 868. [Abstract] [Full Text] [PDF] |
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