Communicable Disease

Background

Communicable, or infectious diseases, are caused by microorganisms such as bacteria, viruses, parasites and fungi that can be spread, directly or indirectly, from one person to another. Transmission can occur in a variety of ways, including direct physical contact with an infectious person, consuming contaminated foods or beverages, contact with contaminated body fluids, contact with contaminated inanimate objects, airborne (inhalation), or being bitten by an infected insect. Some disease agents can be transmitted from animals to humans, and some of these agents can be transmitted in more than one way.

Preventing and controlling the spread of disease is at the heart of much public health work.

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