User blog comment:Krishna d/The Dawn of the Infection/@comment-71.156.166.88-20091202034432

Well, the infection probably started off small and, as Bill said, changed into more severe conditions. Either CEDA or any sort of government controlling the situation called it "a rare form of rabies" as a cover up story, or actually had no idea how it formed and just considered it rabies, since they seem to have yet to find a cure... but of course, it has only been 3 weeks since the infection, so.... ya

I believe it started to the west first, since in the map of the 2nd saferoom in "Crash Course" of L4D1, the west coast is wiped out with X's