Question: Can Streptococcus Grow On MSA?

What Bacteria grows on MSA?

Staphylococcus aureus and Staphylococcus epidermidis on mannitol salt agar.

Mannitol salt agar is a commonly used growth medium in microbiology.

It encourages the growth of a group of certain bacteria while inhibiting the growth of others..

Does Staphylococcus aureus grow on MSA?

Organisms from other genera may grow, but they typically grow very weakly. MSA also contains the sugar mannitol and the pH indicator phenol red. … Most pathogenic staphylococci, such as Staphylococcus aureus, will ferment mannitol. Most non-pathogenic staphylococci will not ferment mannitol.

What Agar does Streptococcus grow on?

The streptococci are usually isolated on Blood agar. Blood agar is one of the most commonly used media in a clinical lab. It consists of an enriched agar base (Tryptic Soy agar) to which 5% sheep red blood cells have been added.

Does E coli grow on MSA?

(A) Staphylococcus aureus, (B) Staphylococcus epidermidis, and (C) Escherichia coli streaked on a mannitol salt agar plate. … The growth of E. coli was inhibited by the high salt concentration.

What is the difference between streptococci and staphylococci?

Staphylococci are Gram-positive cocci that grow in clumps, are catalase test positive and coagulase test positive ( Staph. … Streptococci are Gram-positive cocci that grow in pairs or chains. They are readily distinguished from staphylococci by their Gram-stain appearance and by a negative catalase test.

Does Streptococcus grow on mannitol salt agar?

Both streptococcal organisms are catalase negative and beta-hemolytic on sheep blood agar plates. Also, neither would grow on the mannitol salt agar. Streptococcus pyogenes is sensitive to growth inhibition by bacitracin, whereas Streptococcus agalactiae (group B streptococci) is not.