Syndergaard is expected to be sidelined 7-10 days, and may only miss one start.
James Wagner of the New York Times reports that it is possible Syndergaard picked up the disease while working at a kids camp during the All-Star Break.
According to MayoClinic, hand, foot and mouth disease is "a mild, contagious viral infection common in young children - is characterized by sores in the mouth and a rash on the hands and feet."
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