Theriot, batting .190 for the season, was bothered by his illness so much that he couldn't fly east with the team on Thursday. The infielder missed Friday and Saturday's games while ill and in transit, and his absence in that latter game forced manager Bruce Bochy to make a difficult decision.
The Giants had overextended themselves by using pinch-hitters in the top of the ninth inning, and after tying the game, they had to use Aubrey Huff at second base for the first time in his career. Huff didn't cover the bag on a key play in the ninth inning, but Bochy said he was in a difficult spot.
"I don't think I'll put Huff at second anytime soon," Bochy said. "It makes it tough when you've gone one extra infielder and he goes down or he's sick. It makes things tough. And I wouldn't have done that if it weren't the ninth inning. We made some moves there where I was forced to play Huff at second base."
San Francisco is also waiting on second baseman Freddy Sanchez, who is about to begin an injury rehab stint in the Minor Leagues to test his damaged right shoulder. Sanchez hasn't played since last June, and his healthy return would give the Giants another option in the infield.
Currently, the Giants have Theriot splitting time with Emmanuel Burris at second base. They only have three other healthy reserve position players -- backup catcher Hector Sanchez and first basemen Brandon Belt and Brett Pill -- because they're currently carrying a 13-man pitching staff.
"I think it helps cover you," said Bochy of a seven-man bullpen. "The first game, we went through all of them. Yesterday, if something happens early, then you're really putting pressure on your bullpen and overtaxing them. [But] if I had my way, sure, an 11-man staff would be a lot easier to manage."
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.