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Chicken Pox Learning Center
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Varicella, or chickenpox, is an acute communicable disease characterized by a generalized vesicular rash. Because it is highly contagious, most individuals contract it in childhood.
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Varicella-zoster virus, a herpesvirus, causes varicella (chickenpox) and, after endogenous reactivation, herpes zoster (shingles). Varicella, which is recognised by a characteristic vesicular rash, arises mainly in young children, although older individuals can be affected.
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Warts are benign epidermal neoplasms that are caused by human papilloma viruses (HPVs), which are small DNA viruses. There are more than 100 different types of HPVs, and new types are discovered each year.
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The central nervous system (CNS) has no lymphatic system as such, and although usually well protected from direct infection, its resistance to any infection that does occur is low. The patterns of infective illness are relatively few, but the organisms that can produce disease are many.
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