Vaccination (AQA GCSE Biology Combined Science): Flashcards
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Purpose of vaccination
Purpose of vaccination
Makes individual immune to disease before infection
What is herd immunity?
What is herd immunity?
Immunising large proportion of population reduces spread
What do vaccines replicate?
What do vaccines replicate?
First infection (so body prepared for real exposure)
What do vaccines contain?
What do vaccines contain?
Dead or inactivated pathogen
How vaccines stimulate WBCs
How vaccines stimulate WBCs
Produce antibodies complementary to antigens
Antibody production: secondary infection
Antibody production: secondary infection
Much quicker than primary infection
Example: disease eradicated by vaccination
Example: disease eradicated by vaccination
Smallpox
How do vaccines prevent epidemics?
How do vaccines prevent epidemics?
Through herd immunity
Vaccine disadvantage: effectiveness
Vaccine disadvantage: effectiveness
Not always effective in providing immunity
Vaccine disadvantage: side effects
Vaccine disadvantage: side effects
Bad reactions like fevers (very rare)