Virus: "Andromeda Strain" - actually an extra-terrestrial organism. Symptoms: Rapid blood clotting Notorious for being a bit lengthy and plodding, The Andromeda Strain has nonetheless gone on to become a cult classic, revered for its faithfulness to the novel it's based upon. The deadly organism, codenamed "Andromeda," isn't actually a virus, but it does act like one and is originally misinterpreted as one by scientists in the film. Andromeda is capable of killing people extremely quickly, by causing the blood to clot at an incredibly fast rate. Scientists discover that the strain can be destroyed by alkalinity, flushing the organism into the ocean, although the end of the film brings into question just how effective this method is...
