[Name] Bliss Virus [Source] Doctor Who: Gridlock [Symptoms] 
Appeared around five billion years into the future on New Earth. It began when New Earthlings developed a new mood-drug called Bliss. The world became addicted to it and, in Novice Hame's words, "A virus mutated inside the compound and became airborne. Everything died. Even the virus in the end. It killed the world in seven minutes flat."