Abstract
Vitamin A was used as adjuvant, comparatively with Al(OH)3, in pertussis, tetanus and diphtheria vaccines. Both groups induced a primary immune response in mice, and one single booster dose elevated the antibodies titers in average 554 times to vitamin A groups and 104 times to Al(OH)3. These antibodies titers correlate with sera IL-4 in immunized animals, suggesting a Th2 response. Other cytokines detected in the sera and/or lymphocytes culture supernatants (IL-2 and IFN-□) indicated that vitamin A could also modulate a Th1 response in DPT and acellular pertussis vaccines.
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