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To be clear:
• Varicella is the primary viral infection that causes chickenpox.
• Herpes zoster is the reactivation of this virus which is manifested as "shingles".
The medical name for shingles is "herpes zoster." The virus that causes herpes zoster is the same virus that causes chickenpox (varicella). Resulting from a reactivation of VZV, shingles manifests as a rash on the skin and irritation of the nerve supplying a dermatome. Shingles most commonly occurs in older people. The virus that causes shingles is a dormant virus of chickenpox, that has lodged in the nerves near the spinal ganglion, according to the now universally accepted theory of Dr. Hope-Simpson. Shingles is thus a re-activation of the virus that initially caused chickenpox, and occurs when an individual has a compromised immune system. |