Final answer:
Contagious diseases can be transmitted between individuals, while infectious diseases can be spread but not necessarily through direct contact. Cardiovascular disease, however, cannot be spread from person to person.
Step-by-step explanation:
A contagious disease is a type of disease that can be transmitted from one person to another through direct contact or through the air. Examples of contagious diseases include the flu, chickenpox, and tuberculosis.
Infectious diseases are caused by pathogenic microorganisms such as bacteria, viruses, fungi, or parasites. These diseases can be spread from one person to another, but not all infectious diseases are contagious. Some examples of non-contagious infectious diseases include tetanus and malaria.
On the other hand, cardiovascular disease refers to a class of diseases that affect the heart or blood vessels, such as heart attacks, strokes, and heart failure. These diseases are not contagious or communicable.
Learn more about Types of diseases