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VARICELLA CAUSES |
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In a typical scenario, a young child is
covered in pox and out of school for a week. The first half of the
week the child feels miserable from intense itching; the second half
from boredom. Since the introduction of the varicella vaccine,
classic varicella is becoming less and less common. Varicella is extremely contagious, and can be spread by direct contact, droplet transmission, and airborne transmission. Even those with mild illness after the vaccine may be contagious. When someone becomes infected, the pox usually appear 10 to 21 days later. People become contagious 1 to 2 days before breaking out with pox. They remain contagious while uncrusted blisters are present, usually less than a week after breaking out. Once someone catches varicella, the viral infection usually lasts for a lifetime, with the virus kept in check by the immune system. About 1 in 10 adults will experience shingles when the virus re-emerges during a period of stress. Most cases of varicella occur in children younger than ten. The disease is usually mild, although serious complications sometimes occur. Adults and older children usually get sicker than younger children do. Children under one year of age whose mothers have had varicella are not very likely to catch it. If they do, they often have mild cases because they retain partial immunity from their mothers' blood. Children under one year of age whose mothers have not had varicella, or whose inborn immunity has already waned, can get severe varicella. The pox are worse in children who have other skin problems, such as eczema or a recent sunburn. Complications are more common in those who are immunocompromised either from an illness (such as AIDS) or from certain medicines (such as chemotherapy). Some of the worst cases of varicella have been seen in children who have taken steroids during the incubation period, before they have any symptoms. These children are usually being treated for asthma. |
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