AIDS.

Aids is a disease that affects to human beings infected with HIV. We say that a person has aids when his/ her body isn't able to face infections that affect humans because of an immunodeficiency caused by the HIV.

Aids is the inability of the immune system to face infections and other pathological processes. It's developed when the Lymphocyte level drops below 200 cells per milliliter of blood.

I think that prevention is the best you can do for to do not suffer this illness. Aids is something very serious because anybody can have it.

Aids affects more in other counties because its inhabitants do not have access to health services. I chose Africa because I think it's a good example.