How would a vaccine prevent someone getting an infection?
Vaccines are made of dead or inactive pathogens. White blood cells in the body come into contact with the pathogen and produce antibodies which destroy the pathogen. The body produces memory cells which means when it is reinfected by the pathogen, it can quickly produce antibodies to destroy the pathogen before symptoms develop.
ND
Related Biology GCSE answers
All answers ▸Explain how a reflex arc works using an example
Describe what an enzyme is and explain how it works
Infections can also be caused by viruses. Describe the lytic pathway of a virus and how this causes the spread of infection through a population.
Outline the major stages of cell cycle.