No one can answer unless you tell the NAME of the disease in your question.
The ideal way to prevent people from spreading any infectious disease would be to place them in a hospital and treat them, until they are cured.
There is absolutely no way to prevent Alzheimer's disease. There is also no known cure for this, all you can do is be prepared for the worse and pray you'll be fine.
The laws of nature conspire to prevent it from being any other way.
There is no way to prevent the disease.
Unfortunately, there is no way to prevent hypoparathyroidism. A doctor can give you literature on how to live with the disease.
There is no known way to prevent Lou Gehrig's disease or to alter its course.
Washing your hands.
Handwashing
No two people, regardless of sexual orientation, cannot form a disease. A disease needs a virus, bacteria, or other cause.
The best way to prevent bone disease is to make sure your bones are as healthy as possible. Strong bones can be achieved through proper nutrition and calcium in take.
store..... eliminate.... make..... spray.....
Exercise is a great way to keep your heart healthy and strong and prevent heart disease. Eating right with lots of fruits and veggies and little or no fried foods or foods high in trans fats is also effective.