
To explain:
“Accidental herd immunity” conferred by polio vaccine in the developing world has aided the elimination of polio from many countries.
Introduction:
Immunization is a process in which vaccines are injected inside body. It helps in the activation of immune response as weakened antigens activate the immune system cells like B cells to produce antibodies.
To explain:
Accidental herd immunity and way it works.
Introduction:
Immunity is an internal defense mechanism of an organism which confers resistance against attack by foreign pathogens inside the body. There are two types of immunity called as active and passive immunity. Active immunity is a state in which the immune system is activated after receiving a foreign antigen. Passive immunity is a state in immune system gets developed in a child after breast feeding of milk from mother.

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Chapter 17 Solutions
Microbiology Fundamentals: A Clinical Approach
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