Diseases and the Immune System.

Diseases and the Immune System. What is a disease? A disease is an illness or sickness caused by a virus, bacteria or parasite that presents with certain symptoms and physical signs. There are many diseases that are present in our modern day world and each of these presents with specific symptoms and physical signs, which allow doctors to make a diagnosis and treat the illness. Diseases include such things as measles, mumps, chicken pox, cholera, …showed first 75 words of 958 total…

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