O2STK is in possession of an anti-vampire vaccine. It is also called the "Von Tessie Formula", presumably after the Middleman who invented it.

The vaccine is blue in color and delivered by injection. Once administered, it prevents a human bitten by a vampire from becoming a vampire himself. However, the vaccine can do nothing about the fact that the vampire now knows his victim's entire life story.

The only known recipient of the vaccine is Clarence Colton, who received it after being bitten by Vladdy.

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