The prevention of venereal diseases is most important in safe sexual behavior.

Prevention of infectious diseases is important with hand washing and wearing masks.

Do you understand the necessity of this project?

He is suffering from heart disease.

Gonorrhea is one of the sexually transmitted diseases, and appropriate treatment is necessary.

I think he is appropriate for that job.

That proposal is not appropriate.

He ate one apple.

He finally recovered after a long period of medical treatment.

He went to the doctor to treat his severe cold.