(a) Demand of resident of the colony that AIDS patient should leave the colony is totally wrong unjustified, unscientific and based on wrong beliefs. The person suffering from AIDS should be allowed to stay in the colony because the AIDS is not a contagious disease and does not spread through touching, hugging or sharing the belongings.
(b) To preventive measures include :
1. avoid multiple sexual partners
2. use disposable needles and syringes
3. use condoms
4. promoting regular check up for HIV in susceptible population.
(c) Causative agent : HIV-Human immunodeficiency virus (A kind of retro virus with RNA genome).