The Wellcome Trust Lecture

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Abstract
The modern biology era in which molecular analyses dominate and immunology, cell biology and molecular genetics are prominent, has created unprecedented opportunities for the vaccine developer. The need for new and improved vaccines against many infectious disease agents is also great, no more so than for the protozoan and helminth parasite scourges of the rural poor in the tropical, less-industrially developed world. Despite the opportunities and needs, no vaccine against any human parasite yet exists nor does any molecular vaccine against any parasite; this chapter is a general discussion on the reasons for this state of affairs that assuredly will change soon.