Courtesy of you my English is going well now! In the near future, I wanna use this word more and more when I talk with people from foreign countries!!
合っているんでしょうか?
今イタリアなので、頭がこんがらがってます・・・。
Chickenpox has nothing at all to do with chicken. The name was meant to distinguish this "weak" form of the pox from smallpox. "Chicken" is used here, as in "chickenhearted," to mean weak or timid. (medicinenet.comより)