The correct option is
B a - ii, b - v, c - iv, d - iii
- Conjugate vaccines combine a weak antigen with a strong antigen so that the immune system has a stronger response to the weak antigen. Example: Haemophilus influenza.
- Toxoid vaccine is made from a toxin (poison) that has been made harmless but that helps in an immune response against the toxin. They are based on the toxin produced by certain bacteria (e.g. tetanus or diphtheria).
An
- The attenuated vaccine is a vaccine created by reducing the virulence of a pathogen, but still keeping it viable. Example are Measles, mumps, rubella, yellow fever.
- Inactivated whole-cell vaccines are made from microorganisms (viruses, bacteria, other) that have been killed through physical or chemical processes. An example is Polio, bubonic plague, Hepatitis A.