Why do communicable diseases occur? How they spread?
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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. Some are transmitted through bites from insects while others are caused by ingesting contaminated food or water.
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Communicable diseases occur when they are carried by vectors . Some examples of diseases are malaria and dengue which are carried by vectors like mosquito .
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