Vaccination

Question 1

How to vaccinations work

Answer 1

• introduce small quantities of dead or inactive forms of pathogen into body
• as pathogen is dead or inactive it can’t lead to disease in the patient
• wbc stimulated to produce antibodies against dead pathogen
• at same time wbc divides by mitosis
  = produce lots of copies of itself
  = copies of wbc stay in blood for decades
  = if same pathogen renter body again wbc can produce correct antibodies quickly
  = prevent infection

Question 2

Describe herd immunity

Answer 2

If enough people are vaccinated this also protects unvaccinated people
= means unvaccinated person can’t catch disease as no one around them can pass the pathogen on