The broad categories of diseases that afflict human beings continue to evolve as do the methods used to detect and evaluate them. Although most of the infectious diseases that affect the brain remain the same, there are a number of unusual infections that have appeared. Infectious agents are opportunists and will take advantage of weaknesses in the immune system that appear under a variety of conditions. Medical advances have lead to treatments and therapies that compromise the immune system. How, and under what setting, these defects in the immune system appear influences the type of organism that invades and how the host responds to it. Manipulation of the immune response in the setting of transplantation and the appearance of acquired immune deficiency syndrome (AIDS) are examples in which unusual infections occur.
KeywordsApparent Diffusion Coefficient Magnetic Resonance Spec West Nile Virus Acquire Immune Deficiency Syndrome Prion Disease
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