Vaccination

Question 1

What is Passive immunity

What is Active Immunity

Answer 1

Introduction of antibodies from outside source, they are not replaced no long immunity. E.g Mother pass antibodies through placenta.
Stimulating antibody production by individual by direct contact to antigen. Memory cells made Artificial - immune after vaccination - harmless antigen.

Question 2

General idea on vaccination

Answer 2

Contain antigen causing production of memory cells- immune. Rapid production of antibodies protects population. Need to be available, few side effects and train staff.

Question 3

Herd immunity

Answer 3

Large proportion of population vaccinated to less pathogen passed on as people are immune. Essential as not possible to vaccinate everyone.

Question 4

Why might vaccination not work

Answer 4

Pathogen may mutate changing antigen not recognized so no antibody produced as T cell don’t bind to them. Also some pathogen may be hard to reach live in intestines