vaccination DEFINITELY IN EXAM

Question 1

explain the process of vaccination

Answer 1

• a dead/inactive pathogen is injected into the body
• white blood cells are stimulated to produce antibodies against the dead pathogen
• white blood cell divides by mitosis to produce lots of copies of itself
• if infected again the same white blood cells can now produce the antibodies which bind to the antigens on the pathogen this prevents infection

Question 2

explain herd immunity

Answer 2

the unvaccinated people cannot catch the disease because no-one around them pass the pathogen on