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Chickenpox, also known as varicella (/ ˌ v ɛ r ə ˈ s ɛ l ə / VER-ə-SEL-ə), is a highly contagious disease caused by varicella zoster virus (VZV), a member of the herpesvirus family. [ 3 ] [ 7 ] [ 5 ] The disease results in a characteristic skin rash that forms small, itchy blisters , which eventually scab over. [ 1 ]
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 ]
Varicella, commonly known as chickenpox, is a highly contagious disease that is very uncomfortable and sometimes serious. It is caused by the varicella-zoster virus (VZV). Before the vaccine, about 4 million people in the United States would develop chickenpox annually.
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.
Chickenpox-like rashes were recognized and described by ancient civilizations; the relationship between zoster and chickenpox was not realized until 1888. [29] In 1943, the similarity between virus particles isolated from the lesions of zoster and those from chickenpox was noted. [30] In 1974 the first chickenpox vaccine was introduced. [31]
Chickenpox —which is caused by the varicella-zoster virus, a type of herpes virus — was considered just a normal part of growing up until the vaccine became available in 1995.
Immunity wanes, so even if you got vaccinated last year, you should get the latest version this fall, Dr. Kavasery says. ... Shingles is a viral infection—caused by the same virus as chickenpox ...
is the average number of people infected from one other person. For example, Ebola has an of two, so on average, a person who has Ebola will pass it on to two other people.. In epidemiology, the basic reproduction number, or basic reproductive number (sometimes called basic reproduction ratio or basic reproductive rate), denoted (pronounced R nought or R zero), [1] of an infection is the ...