Childhood immunizations in the United States Side effects of this vaccine can include: More severe symptoms may include Varicella spreads person to person through the air from coughing or sneezing, touching or breathing in the virus that comes from the chickenpox blisters, and can be spread from people with Shingles. It takes 10 to 21 days after exposure to develop symptoms and it lasts about 5–10 days. For the most part, getting the chickenpox provides immunity for life. Although uncommon, it is possible for some people to get chickenpox more than once. Symptoms of the varicella disease may include Complications that can arise are Some people
Rare disease treated, are excluded from their definition. The definitions used in the medical literature and by national health plans are similarly divided, with definitions ranging from 1/1,000 to 1/200,000. Because of definitions that include reference to treatment availability, a lack of resources, and severity of the disease, the term "orphan disease" is used as a synonym for "rare disease". But in the United States and the European Union, "orphan diseases" have a distinct legal meaning. The United States' Orphan Drug Act includes both rare diseases and any non-rare diseases "for which there is no reasonable expectation that the cost of developing