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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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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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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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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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Nothing in clinical neurology exceeds the demands on the clinician more than diagnosing and managing the patient with headache, a process that demands a combination of clinical skill and good interpersonal relationships. The physician dealing with the patient who presents with headache will by the history determine the likely diagnosis; by the brief, structured examination receive some reassurance that there is no lurking lesion causing the problem; and by his or her ability to see past the patient's naive words of complaint, recognize a pattern of symptomatology, allowing a confident diagnosis that will allow equally confident management.
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