Varicella zoster virus (VZV) causes chickenpox. The disease is highly contagious - for more than 90% of non-immunized individuals will develop chickenpox after exposure. VZV is transmitted as well as directly on the skin-to-skin contact and through respiratory droplets (eg coughing, sneezing), by an infected individual. Even though the average incubation period of exposure to onset of symptoms of the virus is 12-14 days, a larger window of 10-21 days post-exposure is quoted in the literature.
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