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Q. 29 But how can there suddenly be a disease that never existed before?
Ans. If we look at AIDS as a worldwide pandemic, it appears as if it is something new and rather sudden. But if we look at AIDS as a disease and at the virus that causes it, we get a different picture. We find that both the disease and the virus are not new. They were there well before the epidemic occurred. We know that viruses sometimes change. A virus that was once harmless to humans can change and become harmful. This is probably what happened with HIV long before the AIDS epidemic. What is new is the rapid spread of the virus. Researchers believe that the virus was present in isolated population groups years before the epidemic began. Then the situation changed ? people moved more often and traveled more, they settled in big cities and lifestyles changed, including patterns of sexual behaviour. It became easier for HIV to spread through sexual intercourse and contaminated blood. As the virus spread, the disease which was already in existence became a new epidemic.