vaccinations

Question 1

What is a vaccination?

Answer 1

An injection containing dead or inactive pathogens that stimulate white blood cells to make antibodies

Question 2

What does vaccination a large number of the population do to the spread of pathogens?

Answer 2

The spread is reduced

Question 3

Describe 6 steps as to how pathogens work

Answer 3

1. Vaccine enters body, pathogen makes immune system respond
2. White blood cells make antibodies to attack pathogen
3. Pathogen has been made harmless so is destroyed quick
4. Body now has defences against pathogen
5. The defences are antibodies in blood and memory cells (type of white cell)
6. If pathogen attacks body again, the memory cells produce antibodies to destroy it quickly