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Unless the immune system is compromised, it suppresses reactivation of the virus and prevents shingles outbreaks. Why this suppression sometimes fails is poorly understood,  but shingles is more likely to occur in people whose immune systems are impaired due to aging, immunosuppressive therapy , psychological stress , or other factors.   Upon reactivation, the virus replicates in neuronal cell bodies, and virions are shed from the cells and carried down the axons to the area of skin innervated by that ganglion. In the skin, the virus causes local inflammation and blistering. The short- and long-term pain caused by shingles outbreaks originates from inflammation of affected nerves due to the widespread growth of the virus in those areas. 
On You Tube, do a search for a documentary titled Run From The Cure . If you want it on a disk to give to someone, you can buy a copy of it on Ebay or you can copy it directly from You Tube. This potent and effective cancer treatment has cured thousands. No clinical study will ever be done because no one can patent it. Without a patent, no pharmecuetical company can recoup the many millions of dollars required to do the study. So it won't be done. We are left with anecdotal evidence but, fortunately, the evidence is voluminous! Like MMS, it is in the catagory of you-have-nothing-to-lose by trying it. Hemp oil is made from the flowering buds of the marijuana plant. This is very different from hemp seed oil you buy at the grocery store for cooking. If you live in a state which offers medical marijuana you are in luck. You can try the cure. Making hemp oil is also very simple and there are multiple episodes on You Tube showing you how to do this. If you have cancer or know someone who has cancer, you must visit this natural healing wonder.