"We're hoping anything he has doesn't go to anyone else," said Girardi, "but if you start getting these [illnesses], they can start going around the clubhouse."
Beltran, 38, is riding a 13-game hitting streak, during which he is batting .320 (16-for-50) with seven runs, four doubles, three homers, nine RBIs and two walks, raising his season average from .187 to .234.
Bryan Hoch is a reporter for MLB.com. Follow him on Twitter @bryanhoch, on Facebook and read his MLBlog, Bombers Beat. This story was not subject to the approval of Major League Baseball or its clubs.