This agar is used for isolation and quantification of staphylococci. The composition includes tellurite solution of potassium and lithium chloride, which are growth inhibitors concomitant microflora. Also, staph recovers tellurium from tellurite potassium, which stains its colonies in the black color. Glycine and sodium pyruvate simulate the growth of staphylococci. In the ready environment is added a suspension of egg yolk, which gives the opportunity to check lecithinase activity from staphylococci.