Tuesday, September 6, 2011

Aids O/L Biology

This virus attacks the body immune system. By this body loses its ability to fight with infections and diseases causing infections.After infection a person may not show any symptoms of the diseases for a period of about 2-15 years.After reaching the aids stage the following may appear
1.tiredness
2.fever
3.diarrhoe
4.loss of weight
5.heavy breathing
6.enlargement of limph glands

In reality there is no treatment for AIDS.

STD O/L Biology


Sexually transmitted infections
Sexually transmitted infections are those diseases that can get transmitted from one person to another as a result of sexual conduct between two persons.
Not only sexual conduct but also the following factors are influence to spread those diseases.
1.blood transfusions
2.by stringes and neetles
3.by shaving blades and surgical instruments
4.through a infected mother