Two of 4 subjects dosed in a previous study with a modified formulation of Valortim experienced treatment related adverse events which were suggestive of allergic or allergic-like reactions. In order to better characterize these reactions and determine if they represent allergic or allergic-like reactions to Valortim or one or more of its components, skin testing of Valortim and selected components on naïve and Valortim-exposed subjects will be performed in this study