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Infection and Immunity, October 2000, p. 5657-5662, Vol. 68, No. 10
Laboratoire du BCG1
and Unité de Physiopathologie de
l'Infection,3 Institut Pasteur, 75724 Paris
Cedex 15, France, and Département du BCG, Institut
Pasteur de Téhéran, Teheran, Iran2
Received 31 March 2000/Returned for modification 5 May
2000/Accepted 12 July 2000
We compared cellular immune responses to rectal, subcutaneous, and
intradermal administration of Mycobacterium bovis BCG for 5 to 20 weeks in mice, guinea pigs, and macaques. Strong
lymphoproliferative responses were induced in spleen cells after in
vitro stimulation with purified protein derivative in guinea pigs and
macaques, whatever the route of immunization. Comparable high numbers
of gamma interferon- and tumor necrosis factor alpha-producing cells were found in the spleen after rectal, subcutaneous, and intradermal immunization of mice and macaques. Similar levels of precursors of
cytotoxic T lymphocytes specific for mycobacterial antigens were
observed in mice for all immunization routes. In macaques, cytotoxic
activity, determined only at the end of the experiment (20 weeks), was
similar after rectal and intradermal immunization. Six months after
immunization, rectal and subcutaneous routes induced in mice similar
levels of protective immunity against challenge with a virulent
Mycobacterium tuberculosis strain (H37Rv). Rectal
immunization gave immune responses and protective capacity similar to
those for parenteral immunization and seemed to be a promising new
route of vaccination against tuberculosis; in our study, immunization
via the rectal route never induced side effects associated with
parenteral routes (axillary adenitis) and could also effectively reduce
the risks of viral transmission associated with unsafe injections in
the developing world.
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Mycobacterium bovis BCG Induces Similar Immune
Responses and Protection by Rectal and Parenteral Immunization
Routes
*
Corresponding author. Mailing address: Unité de
Physiopathologie, Institut Pasteur, 25 rue du Dr Roux, 75724 Paris
Cedex 15, France. Phone: (33) 1 45 68 86 68. Fax: (33) 1 40 61 33 32. E-mail: gmarchal{at}pasteur.fr.
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