a) Define the term prophylaxis. b) Name the four categories of materials used for preparing vaccines. [5 MARKS]

a) Define the term prophylaxis. b) Name the four categories of materia

1.	a) Define the term prophylaxis. b) Name the four categories of materials used for preparing vaccines. [5 MARKS]
Answer» a) Define the term prophylaxis. b) Name the four categories of materials used for preparing vaccines. [5 MARKS]