Chicken pox

Chickenpox is a highly contagious illness caused by primary infection with varicella zoster virus.

Season 1
Arthur mentions that the Tibbles have the chickenpox.

Arthur, and eventually D.W., contract the disease.

People Who Have Had It

 * Arthur Read
 * D.W. Read
 * Jane Read
 * David Read
 * The Tibble Twins

Arthur

 * D.W.'s Imaginary Friend (mentioned)
 * Arthur's Number Nightmare (mentioned)
 * Arthur's Number Nightmare (mentioned)

Books

 * Arthur's Chicken Pox