What disease is the worst?

Answer 1

The one that kills you.

Worldwide, lower respiratory diseases are the leader by far: pneumonia, other diseases of the windpipe, bronchial tubes and lungs, along with tuberculosis, whooping cough and Legionnaire's disease.

AIDS is number 2 worldwide.

Answer 2

leprosy, it is rare but extremly painful it takes hours of needle injections to remove layers of infected skin, and your completely cut off and must live in a lepper colony if you contract the disease it is so extremly dangerous that hugging a lepper can give you the disease, it makes your organs fail and your skin falls off your body and bone structure it is a long and painful way to die. also amebic disentary is close second where you get diarehia forever and your body dries up and you die, that's a pretty bad one too, the number one killer of women is Heart disease, and cancer comes in as the most PREVENTABLE disease in the world.