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In terms of cause and effect, a root cause is the cause of symptoms and a symptom stemming from a root cause is the effect of the root cause. There is no entity disease involved in cause and effect.
Infectious diseases are illnesses that are contagious, meaning they can be spread from one person to another. Infectious diseases are caused by microorganisms, called pathogens, or what we commonly refer to as germs. Viral and bacterial infections are the most common causes of infectious disease.