The most common feature for antigen-delivery systems is their particulate nature. Together with a certain depot effect, it is the particulate nature that primarily dictates whether the antigen-delivery system will be successful in inducing a certain type and strength of immune response. In this article, we will summarize recent data on particulate delivery systems for peptide and protein antigens with a main focus on lipid or polymer-based particles, all of which possess high potential as both preventive and therapeutic vaccines for parenteral, nasal, and possibly oral administration.
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Liang et al. (2006) studied this question.