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Infectious diseases are caused by ____.

User Aaron
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Infectious disease are caused by microorganisms like virus , bacteria , sometimes fungal infections
User Jeremyharris
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Infectious diseases are caused by microorganisms that enter your body, through a contaminated source, which can be food, water, a person, air, etc.

These microorganisms can be either bacteria, fungi, viruses, etc.

Hope it helped,

BioTeacher101

User Acapola
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