Chicken pox

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

D.W.'s Imaginary Friend
Arthur mentions that the Tibbles have the chicken pox.

Arthur's Chicken Pox
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