a) What precaustion(s) would you recommend to a patient requiriting repeated blood transfusion?
b) If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/he body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

A heavity bleeding and bruised road accident victim was brought to a nursing home . The doctor immediately gave him an injection to protect the patient's against a deadly disease. (a ) Write what did the docter inject into the patient's body . ( b) How do you think this injection would protect the patient againts the disease ? ( c) Name the disease against which this injection was given and the kind of immunity it provides .