<P> In the tropics, chickenpox often occurs in older people and may cause more serious disease . In adults, the pock marks are darker and the scars more prominent than in children . </P> <P> In the United States, the Centers for Disease Control and Prevention (CDC) does not require state health departments to report infections of chickenpox, and only 31 states currently volunteer this information . However, in a 2013 study conducted by the social media disease surveillance tool called Sickweather, anecdotal reports of chickenpox infections on Facebook and Twitter were used to measure and rank states with the most infections per capita, with Maryland, Tennessee and Illinois in the top three . </P> <P> Why the term was used is not clear but it may be due to it being a relatively mild disease . It has been said to be derived from chickpeas, based on resemblance of the vesicles to chickpeas, or to come from the rash resembling chicken pecks . Other suggestions include the designation chicken for a child (i.e., literally' child pox'), a corruption of itching - pox, or the idea that the disease may have originated in chickens . Samuel Johnson explained the designation as "from its being of no very great danger". </P> <P> Because chickenpox is usually more severe in adults than it is in children, some parents deliberately expose their children to the virus, sometimes by taking them to "chickenpox parties". Doctors counter that children are safer getting the vaccine, which is a weakened form of the virus, rather than getting the disease, which can be fatal . </P>

Where does the name chicken pox come from
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