How contagious is chickenpox?

Chickenpox contagious
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How contagious is chickenpox?

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Take 100 people sitting in a room together for several hours talking. If only one person has chickenpox, and the other 99 have never been infected with chickenpox or vaccinated with the chickenpox vaccine, then about 85 of the 99 will get chickenpox! Get immunized!

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