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The MS-Virus (Matchless Soldier-Virus) was made by an Umbrella Lab in Raccoon City. Little is known about the virus, however, from the informant's diaries and a few reports, it is revealed that the virus awakens a non-death cell which stops the host from dying. But the virus was never fully completed as only the mouse version was finalised and tested on by the time of the Raccoon City Outbreak. It is nearly impóssible for any samples to have survived the "cleansing" of Raccoon City.