Is Baird Parker Agar selective or differential?

BD Baird-Parker Agar is a moderately selective and differential medium for the isolation and enumeration of Staphylococcus aureus in foods, environmental, and clinical specimens.

What makes Baird Parker Agar differential?

Baird Parker Agar was developed by Baird Parker from the Tellurite-glycine formulation of Zebovitz et al for isolation and enumeration of Staphylococci in food and other material since it allows a good differentiation of coagulase-positive strains.

What bacteria can grow on Baird Parker Agar?

Baird-Parker agar is a type of agar used for the selective isolation of gram-positive Staphylococci species. It contains lithium chloride and tellurite to inhibit the growth of alternative microbial flora, while the included pyruvate and glycine promote the growth of Staphylococci.

What is in Baird Parker Agar?

Baird Parker Agar contains casein peptone, beef extract and yeast extract as sources of nitrogen, carbon, sulfur, vitamins and trace elements. Glycine and lithium chloride : Have an inhibitory action against organisms other than S. aureus.

How is Baird Parker selective?

Publisher Summary. Baird–parker agar is a selective medium for the enumeration of Staphylococcus aureus in foods and this was first reported by Baird–Parker. It is widely recommended by national and international bodies. Selectivity is attained with potassium tellurite and lithium chloride.

How would you distinguish between members of the genus Staphylococcus on Baird Parker?

Differentiation between members of the Genus Staphylococcus is possible: coagulase-positive staphylococci appear as shiny, gray-black, convex colonies with a clear zone surrounding the colonies; while coagulase- negative staphylococci grow poorly and appear as small, dull black colonies while clear or opaque zones are …

How would you distinguish between Staphylococcus aureus S epidermidis on Baird Parker Agar?

Staphylococci produce dark gray to black colonies due to tellurite reduction; staphylococci that produce lecithinase break down the egg yolk and cause clear zones around respective colonies (S. aureus positive, S. epidermidis negative). An opaque zone of precipitation may form due to lipase activity (S.

What is Baird Parker classification?

Baird-Parker, A. C.: A classification of micrococci and staphylococci based on physiological and biochemical tests.

What is the classification of Staphylococcus?

What is the complete taxonomic classification of Staphylococcus aureus?

Integrated Taxonomic Information System – Report

What are the important characteristics of all Staphylococcus?

Characteristics. Staphylococci are Gram-positive, nonspore forming, facultatively anaerobic, nonmotile, catalase-positive or negative, small, spherical bacteria from pairs to, grape-like clusters, from where the name Staphylococcus comes from (staphyle, meaning a bunch of grapes, and kokkos, meaning berry).

What class of organisms are staphylococci?

Staphylococcus aureus The genus Staphylococcus is now classified in a new family, the Staphylococcaceae, order Bacillales, class Bacilli. It is a non-spore-forming, non-motile spherical organism which divides in more than one plane forming irregular grape-like clusters.