Complete the table with a short description of what the vaccine consists of.

What are made in response to the vaccine?

Refer the given table. Which of the following options correctly identifies P, Q, R and S in the table?  Disease Causative agent Vaccine1 Tuberculosis Mycobacterium tuberculosis P2 Measles Q MMR3 R Bordetella pertussis S  P  Q  R S(1) DPT  Flavi virus  Chicken pox  Varicella vaccine(2) DPT  Rubeola virus  Whooping cough  BCG(3) BCG  Rubeola virus  Whooping cough  DPT(4) BCG  Flavi virus  Polio  Salk vaccine

Using your knowledge of the third line of defence, explain why a different vaccine needs to be developed for each infectious disease.

Type of vaccine in which the source of the antigen material is the patient who is to be vaccinated

explain elaborately with scientific knowledge on how the covid vaccine is invented, and its components