Bryan Stow, 42, had been hospitalized in critical condition with probably brain damage as a result of a fight in the stadium parking lot after the opening-day game between the Dodgers and the San Francisco Giants. Stow, a Santa Cruz paramedic, was wearing Giants clothing at the game.
Stow is currently listed in serious condition.
Stow tested positive for urinary tract and staph infections, doctors at San Francisco General Hospital reported. He was treated for high fever for the last several days.
Stow had recently made improvements in communication and interacting with family after suffering a coma for several weeks.
Two suspects were arrested for the beating after an extensive search that lasted for weeks. The two men allegedly were involved in a series of confrontations with Giants fans at that game.
In an Internet posting Monday's, Stow's family also addressed the violence at Candlestick Park during Saturday's football game between the rival San Francisco 49ers and Oakland Raiders that left two people seriously injured. Relatives said they didn't want what happened to Stow to be for nothing.
"We had hoped it would teach people that violence, specifically at sporting events, is unnecessary and wrong," the family said. "Nobody should feel afraid to root for their team, or bring their families to games. ... Our thoughts and prayers are with the victims of Saturday night's game and their families."
The Associated Press contributed to this report.