A disease is a kind of sickness. If a disease is contagious, you can get that type of sickness from other people. Not all types of disease are contagious. Some diseases are common and not life-threatening, but other diseases are very serious and can kill you.

  • Cancer is a disease that affects millions of people.
  • Elderly people might get Alzheimer’s disease. It’s not a contagious disease.
  • A virus that causes a disease is infectious. (You can get from other people.)
  • AIDS is a disease that develops from the HIV virus.
  • The measles is a contagious disease.
  • Ebola is a very dangerous disease. You can catch it from other people.
  • Tuberculosis is a common disease in some third world countries.
  • Malaria is a disease spread by mosquitoes.
  • Cardiovascular disease is not infectious. (This is a disease that affects your heart.)
  • It’s important to pay attention to reports of any new diseases.
  • To help prevent the spread of a disease, you should always wash your hands.
  • Brush and floss your teeth to prevent gum disease.

sick person

He’s dying from an incurable disease.

The word "diseased" is an adjective:

  • I have a diseased tree in my front yard. The tree has to come down.
  • If your kidneys are diseased, you might require dialysis treatments.
  • Richard is going to die because he has a diseased liver.

diseased trees

These trees look as though they are diseased.

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November 4, 2015