Disease
Chickenpox and shingles
Primary varicella vs zoster reactivation
High-yield clue
Generalized vesicles in different stages ('dew drop on a rose petal') is chickenpox; a painful unilateral dermatomal vesicular rash is shingles reactivation.
Overview
Two presentations of varicella-zoster virus: primary varicella (chickenpox) and later reactivation as zoster (shingles), studied for lesion pattern and viral latency.
Classification
- Viral exanthem / reactivation syndrome
- Herpesvirus (VZV)
- Airborne plus contact spread
- Latency in dorsal root ganglia
Lab & identification clues
- Tzanck smear multinucleated giant cells vocabulary
- Vesicles in different stages (varicella)
- Single-dermatome distribution (zoster)
Associations
- Airborne/contact spread of vesicular fluid
- Reactivation with age or immunosuppression
- Postherpetic neuralgia vocabulary
- Vaccine-preventable exanthem
Commonly confused with
- Smallpox (variola)
- Disseminated herpes simplex
- Hand-foot-and-mouth disease
Your notes
Original student-study summary. Sources checked: OpenStax Microbiology 2e, NCBI Bookshelf Medical Microbiology, and CDC topic pages where applicable; reviewed 2026-06. Educational only; no diagnosis, treatment, dosing, or specimen-handling guidance.