Observation

This question was equally popular. Most of the candidates who attempted it performed well in both parts and scored high marks. The weakness recorded in the question is that some candidates were unable to give the full meaning of HIV/AIDS. However, they were able to answer the (b) part successfully which made up for points that was lost out in the (a) part.  Additional points candidates were expected to list are

HIV: HIV means human immuno-deficiency virus. It is a type of virus that attacks, weakens, and destroys the white blood cells which are responsible for immunity in the human body.
AIDS: AIDS means acquired immune deficiency syndrome. It refers to a condition in which a HIV positive person becomes immune deficient as a result of the destruction of the immune system which make the victims becomes vulnerable to different forms of infections to the human body. 

Symptoms of AIDS
1. Frequent diarrhoea.
2. Tuberculosis.
3. Pneumonia.
4. Persistent fever.
5. Weight loss.
6. Recurrent skin infection.
7. Excessive sweating.
8. Recurrent fungal infection in the mouth and throat.
9. Aching muscles and joints.
10. Hepatitis b.
11. Memory loss.
12. Anaemia.
13. Blurred/distorted vision.
14. Swollen lymph glands
15. Nausea.
16. Mouth, genital and anal sores
17. Chronic fatigue
18. Chills.