Immunisation against chickenpox

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Abstract
The natural course of chickenpox is well defined. Most reported cases occur in children under 10, who usually develop a vesicular rash that erupts in clusters and scabs over one week and causes troublesome itching. It is often associated with mild fever and other systemic symptoms. In older patients pneumonia is the most common complication, but bacterial superinfection, meningoencephalitis, and glomerulonephritis may also occur. Death or long term illness from primary chickenpox in immunocompetent children is exceedingly rare. At present, then, chickenpox is a benign illness.