JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
REVIEW
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Human toxocariasis and the visceral larva migrans syndrome: correlative immunopathology.

The surface of T. canis is now recognized as a dynamic structure which turns over quite rapidly and serves as a renewable source of large quantities of antigen(s). The major host responses to these antigens include a marked eosinophilia and hyperglobulinemia. Both of these responses are apparently ineffective at ridding the body of infective larvae. Both eosinphils and IgE antibodies are manifestations of the Th2 subset of T helper cells and the cytokines that they secrete. Further, there is reason to believe that the antigens released from T. canis larvae favor the induction of this cellular population. Finally, there is mounting evidence that the chronic production of parasite antigen and its continued stimulation of the host immune system with a concomitant production of eosinophils can lead to a permanent alteration of the normal organization of the cardiopulmonary system. In the absence of any well-documented drugs capable of killing infective larvae, it would seem that immunological intervention may offer the only way to minimize or neutralize this 'gift from man's best friend'. This chapter was not intended to be an exhaustive review of the literature pertaining to toxocariasis. Several other recent publications will hopefully fulfill the need for more detailed information on the biology of this organism and the clinical spectrum of the disease it produces [16, 138-140]. Finally, a MEDLARS search of the current medical literature should bring anyone up to speed in a very short time.

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