Vaccines protect people against disease. Explain how.

·         Vaccines contain antigens / antigens are injected;

·         Dead pathogens / weakened pathogens;

·         Memory cells made;

·          On second exposure memory cells produce antibodies / become active / recognise pathogens;

·         Rapidly produce antibodies / produces more antibodies;

·         Antibodies destroy pathogens;

·         Herd effect / fewer people to

·         pass on disease;