The NFL's staph infection problem continues to grow, with Indianapolis Colts quarterback Peyton Manning reportedly the latest player revealed to have contracted the infection.

According to the Indianapolis Star, it was revealed at the Colts practice Thursday that a staph infection attacked the bursa in Manning's knee, which forced the quarterback to undergo the first surgical procedure that kept him out of the start of training camp.

The infection also forced doctors to perform a second procedure later in the preseason.

Fellow NFL players Tom Brady and Kellen Winslow have also battled infections. Brady has undergone several procedures to remove an infection from his knee after he initial had surgery to repair ligament damage. Winslow was recently hospitalized to treat a staph infection. According to reports, he was the sixth Cleveland Browns player to contract the infection since 2005.

The NFL is aware of the growing problem.

"Staph infections are an issue across our country in all walks of life," NFL spokesman Greg Aiello told the Star. "Our medical staffs are well aware of the national issue. They heard a presentation on it in Indy at the combine in 2006 from the CDC (Centers for Disease Control). And our medical staffs have discussed it at other meetings over the past several years and have shared information on prevention and treatment of staph.''

According to the newspaper, Manning said the incidents could be isolated.

"We've got to be careful summarizing the NFL as infectious because me and Brady had it,'' Manning told the Star.