3.7 Flashcards
1
Q
what is immunisation
A
prices by which a person develops immunity
2
Q
what is an adjuvant
A
a substance which makes the vaccine more effective, enhancing the immune response
3
Q
what antigens are used in vaccines
A
weakened pathogen
dead pathogens
parts of pathogens
inactivated toxin
4
Q
what is herd immunity
A
occurs when a large percentage of the population are immunised which reduces the spread of diseases
5
Q
what does the threshold for herd immunity depend on
A
the disease
population density
vaccine effectiveness
6
Q
what is antigenic variation a problem
A
some pathogens can change their antigens
7
Q
why is antigenic variation a problem
A
memory cells will be ineffective
8
Q
what does a vaccine have
A
antigens from an infectious disease are mixed with an adjuvant
