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Briefly describe an infectious disease and how it affects a human host.

Briefly describe an infectious disease and how it affects a human host.

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Infectious disease caused by microorganisms that invade tissues. It is caused by bacteria, fungi, viruses and parasites. Many organisms live in and on our bodies. They are normally harmless or even helpful .The disease can be spread directly or indirectly. Some infectious disease can be passed from person to person. Malaria, dengue , tuberculosis are some example of infectious disease.

Some bacteria, fungi and other microbes enter your body and begin to multiply. Bacteria multiply so rapidly they crowd out host tissues and disrupt normal function . Sometimes they kill cells and tissues outright.

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