I forgot about Crossed. Yes I remember reading that as the web comic. I've just tried to revisit the site but the server is down http://www.crossedcomic.com/ If I remember correctly it's a plague that causes people to have a red cross shaped wound on their foreheads. I thought it was an unsubtle attempt to denigrate Christianity, as so much is nowadays, it should have been a star! The infected just behave like the Reavers from Firefly and try to rape and torture everyone.