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Chickenpox is a highly common illness, which mostly affects children. The varicella zoster virus, a member of the herpes virus family, is what causes chickenpox, which is highly contagious. Most cases of chickenpox occur in children 1 to 14 years of age, however some people don’t get chickenpox until their early 20's. The disease is usually mild, and not life threatening in otherwise healthy children, but can be more serious in newborn babies and in adults. A child who has had chickenpox usually does not get it again. Adults may get the disease if they did not have it in childhood. However, they are more likely to develop shingles. In temperate climates, chickenpox occurs most frequently in winter and early spring. Following infection of chickenpox, it usually takes 2 to 3 weeks before the symptoms of chickenpox begin to appear. The infection usually starts with low fever one to two days before the rash appears. The fever usually continues for three to four days, and may be quite high on the third or fourth day. Usually two days later the rash begins as tiny red spots, usually starting on the head, neck and back. Over the course of twelve to twenty four hours these spots turn into small water-filled blisters. After they bli