The Proverbial Apple

Origin
"An apple a day keeps the doctor away" is an English-language proverb claiming that an apple could increase general health. The first recorded use of the proverb was in the 1860s in Wales, UK. The original wording of the saying was "Eat an apple on going to bed and you'll keep the doctor from earning his bread. The newest title was used in print in 1922.  In 2011 a study was found that consumption of apples and pears might prevent strokes.  2012 study found that apple consumption significantly lowered bad cholesterol levels in middle-aged adults.

Effects
It's unknown why the apple kills those in the medical profession. It effects all medical professions from doctors, nurses even animal doctors. The death is instant after taking a bite and swallowing the apple. Once bitten into the apple reforms whole again.

Collection
Was discovered after several doctors where killed. The apple was moved around by the husband of a woman who had died from a tumor in the brain. He blamed the doctors and nurses who were unable to save her.