Gray feeling better, but now Graveman has flu

Sonny Gray originally thought it was food poisoning that robbed him of Opening Day. (AP)OAKLAND -- A's ace Sonny Gray, robbed of an Opening Day start because of what he thought to be food poisoning, believes he actually fell victim to a vicious flu bug that's making its way around a handful of clubhouses.

The A's have seemingly been hit the hardest, as right-hander Kendall Graveman is the latest to turn up ill.

"It was a 24-hour bug that a lot of guys have gotten," Gray said Tuesday before the A's faced the White Sox at the Coliseum, "and I just so happened to get it on the wrong day."

Gray was back in the A's clubhouse on Tuesday.

"As you can see," he said, "there are a lot more hand…