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In 2015 chickenpox resulted in 6,400 deaths globally – down from 8,900 in 1990. [6] [15] Death occurs in about 1 per 60,000 cases. [9] Chickenpox was not separated from smallpox until the late 19th century. [9] In 1888 its connection to shingles was determined. [9] The first documented use of the term chicken pox was in 1658. [16]
Varicella vaccine, also known as chickenpox vaccine, is a vaccine that protects against chickenpox. [9] One dose of vaccine prevents 95% of moderate disease and 100% of severe disease. [ 10 ] Two doses of vaccine are more effective than one. [ 10 ]
Chicken pox can cause up to 500 itchy blisters that dry up and form scabs in four or five days, the CDC says. It can be particularly serious in babies, adults and people with weak immune systems.
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
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Mayo Clinic is a nonprofit hospital system with campuses in Rochester, Minnesota; Scottsdale and Phoenix, Arizona; and Jacksonville, Florida. [22] [23] Mayo Clinic employs 76,000 people, including more than 7,300 physicians and clinical residents and over 66,000 allied health staff, as of 2022. [5]
[14] [15] Before the chickenpox vaccine became available, 100 to 150 children in the U.S. died from chickenpox annually. [13] [16] In the UK, chickenpox vaccinations are not routine, and around 25 people die a year from the disease, with 80% of victims being adults, in the late 1990s. [17]