VJ Agar BD Difco™ 500 g. VJ Agar, also known as Vogel and Johnson Agar, is used for the early detection of coagulasepositive,mannitol-fermenting staphylococci. Use with Chapman Tellurite Solution 1%(Cat. No. 215294). Use for isolating coagulase-positive mannitol-fermenting staphylococcifrom clinical or food specimens.