A) The immune system produces antibodies, which stay in the blood
B) Memory lymphocytes are produced. They remain in the body to fight off any future infection with the live pathogen
C) The dead pathogen stays in the body and constantly stimulates the immune system
D) All of the above
Correct Answer: D
Solution :
Vaccine is a preparation containing dead or inactivated viruses or other microorganisms which on introduction in human body stimulate or initiate the formation of antibodies to fight against diseases. An effective vaccine must induce the right sort of immunity, be stable on storage and have sufficient immunogenicity.
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