The patient in the given case is suffering from Acquired Immuno Deficiency Syndrome (AIDS). In AIDS, the immune system of an individual is severely affected because of the progressive destruction of immune cells. The microbe responsible for AIDS is a virus called Human Immunodeficiency Virus (HIV).
This virus can be transmitted from one organism to another in the following ways:
1. Unsafe sexual contact
2. Transfusion of contaminated blood
3. Use of infected syringes and needles
4. Vertical transmission from mother to the developing fetus