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Am. J. Trop. Med. Hyg., 33(2), 1984, pp. 261-268
Copyright © 1984 by The American Society of Tropical Medicine and Hygiene

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Mechanisms of Protective Immunity against Schistosoma Mansoni Infection in Mice Vaccinated with Irradiated Cercariae

V. ANAMNESTIC CELLULAR and HUMORAL RESPONSES FOLLOWING CHALLENGE INFECTION

Rodrigo Correa-Oliveira, Alan Sher AND Stephanie L. James
Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20205

Mice vaccinated with radiation-attenuated cercariae display low levels of cellular and humoral immune responses toward schistosomulum antigens, as measured in vitro by lymphocyte blastogenesis and quantitation of anti-larval antibodies by indirect immunofluorescence. Both responses wane with time after vaccination. However subsequent challenge infection provokes immune responses of classical anamnestic character, being both more rapid in appearance and of greater magnitude. Antigen responsive cells appear in lymph nodes draining the challenge site within 24 hours after infection. Both circulating anti-schistosomulum surface antibodies as well as cytophilic IgE anti-worm antigen antibodies increase substantially by 1 week after challenge. All of the anamnestic circulating antibodies belong to the IgG class. Those findings support the concept that vaccine-induced resistance to Schistosoma mansoni infection involves sensitized T and B lymphocytes, and point to the possible role of post-challenge anamnestic responses in the effector mechanism of parasite killing in this model.

Accepted for publication October 6, 1983.






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Copyright © 1984 by the American Society of Tropical Medicine and Hygiene.