1.3.4 Recombinant vaccines
Recombinant vaccines are produced by inserting genetic material from a disease-causing organism into a harmless cell, which then makes lots of copies of the antigens of the infectious agent. The antigens are then purified and used as a vaccine. An example is hepatitis B vaccine (the HepB component of the pentavalent vaccine used in Ethiopia).
1.3.3 Sub-unit vaccines