Agradecimentos e Reconhecimentos

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(t To my Mother' 
Acknowledgements 
My thanks to my Mother, Mrs. Patricia Jamison for her encourage­
ment; to Mrs. G. Dique, my typiste and Miss M. L. L. Gomes dos 
Santos, my artist, for their patient endurance; and to all those who 
taught me about Parasitology, Microbiology and Immunology. 
Special thanks to Professor H. J. Koornhof for his constructive 
criticism of the manuscript.