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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.
Communicable diseases are diseases that are caused by bacteria, virus, fungus, or parasites. They are spread from person to person, or animal to person, through direct or indirect contact. Pathogens. A pathogen is an infection causing agent (germ). Pathogens are the cause of communicable diseases. Bacteria, viruses, fungus, and parasites can all be pathogens. The most common pathogens are bacteria and viruses. Causative agent- This is the disease causing agent (bacteria, virus, fungus, parasite).