How do vaccines protect people against disease infections?
Vaccines introduce a live version of the pathogen.
Vaccines stimulate antigens to be produced by the red blood cells.
Vaccines introduce pathogenic antigens, which stimulate the white blood cells to produce antibodies.
What is an antigen?
A chemical produced by the white blood cells
A chemical on the surface of the pathogen
A microbe that causes a disease
What can vaccination involve?
Injecting a dead form of the disease to stimulate immunity
Injecting an inactive form of the disease to stimulate immunity
Injecting an inactive form of the pathogen to stimulate immunity
Vaccination results in the manufacture of memory cells. What do these do?
They enable future antibody production against the pathogen to be slower but in greater quantity
They enable future antibody production against the pathogen to be faster but in lower quantity
They enable future antibody production against the pathogen to be faster and in greater quantity
What is antigenic variation?
The means by which memory cells are able to recognise pathogens
The ability of some pathogens to alter their antigens to avoid detection
A mutation of an antibody that mean it can’t attack pathogens