Poor health can be caused by diseases. Often, different diseases interact, and this can lead to further health complications that don't seem related at first.

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A number of diseases are responsible for ill health. Well-being is the state of being physically and mentally healthy. A disease may be either contagious or non-contagious.



What are communicable diseases?

Those diseases that can spread from person to person or between humans and animals are known as communicable diseases. Bacteria, viruses, parasites and fungi can all cause these conditions. These conditions are sometimes referred to as contagious or infectious diseases. Measles and malaria are examples of communicable diseases.

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