The document discusses four case studies related to using nanomedicine for drug and antigen delivery: 1) Vaccine delivery using PLGA nanoparticles containing tetanus toxoid, showing improved immune response from a single dose. 2) Pulmonary delivery of anti-tuberculosis drugs using inhalable microparticles, aiming for targeted delivery to the lungs and macrophages. 3) Using glucose-displaying nanoparticles to target malaria-infected red blood cells through glucose transporters, showing uptake in vitro. 4) Using pulsatile transdermal testosterone patches for male contraception, reducing fertility in rats for over 3 months with no behavioral effects.