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"Absolutely Immune" is the second single from Act. It was released by ZTT Records on 7 September 1987 (1987-09-07). Unlike the previous single "Snobbery and Decay" and its myriad of release formats, "Absolutely Immune" was only released on one 7" and two 12" single formats. The song reached #97 in the UK Singles Chart.
The band's 2004 box set Laughter, Tears and Rage - The Anthology featured a number of previously unreleased tracks from this single. These include an instrumental version of "Bloodrush" entitled "Bloodrush" (Silent), as well as an instrumental version of "Absolutely Immune" and a mix called "Absolutely Immune" (Take 4).