This book provides a comprehensive overview of how use of micro- and nanotechnology (MNT) has allowed major new advance in vaccine development research, and the challenges that immunologists face in making further progress. MNT allows the creation of particles that exploit the inherent ability of the human immune system to recognize small particles such as viruses and toxins. In combination with minimal protective epitope design, this permits the creation of immunogenic particles that stimulate a response against the targeted pathogen. The finely tuned response of the human immune system to small particles makes it unsurprising that many of the lead adjuvants and vaccine delivery systems currently under investigation are based on nanoparticles.