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"Infected" is a song written by Brett Gurewitz from the punk rock group Bad Religion. It was released in 1994 and appears on their eighth proper studio album Stranger Than Fiction. Along with "21st Century (Digital Boy)", "Infected" is considered to be their breakthrough song, as it received airplay from modern rock radio stations. This song was also released in the Harmonix music game Guitar Hero for the PlayStation 2, and was also part of a 3-song Xbox Live download pack on the Xbox 360 title Guitar Hero II on April 11, 2007.