This post was most recently updated on February 19th, 2016Modified oxidase test (microdase) is recommended for Gram-positive, catalase-positive cocci, only. The microdase test is a rapid method to differentiate Staphylococcus from Micrococcus by detection of […]
This post was most recently updated on May 2nd, 2019Hippurate is the glycine conjugate of benzoic acid. When hippurate is hydrolysed by an organism glycine and benzoic acid are formed. In the classical test (48 […]
This post was most recently updated on April 20th, 2019Bile-esculin test is widely used to differentiate Enterococci and Non-enterococcus group D streptococci, which are bile tolerant and can hydrolyze esculin to esculetin, from non-group D […]
This post was most recently updated on April 26th, 2018Salt Tolerance Test is used in the identification of enterococcal group D Streptococcus on the basis of their salt tolerance. The ability of the bacteria to […]
This post was most recently updated on May 21st, 2016Pyrrolidonyl Arylamidase (PYR) test is a rapid test which is used for the presumptive identification of group A beta-hemolytic Streptococci and Enterococci. PYR test is available […]
This post was most recently updated on June 10th, 2019Catalase is an enzyme, which is produced by microorganisms that live in oxygenated environments to neutralize toxic forms of oxygen metabolites; H2O2. The catalase enzyme neutralizes […]
This post was most recently updated on March 26th, 2019Novobiocin test is used to differentiate coagulase-negative staphylococci (CONS) and presumptively identify the isolate as Staphylococcus saprophyticus (novobiocin resistant). It is usually performed on urine isolates […]
This post was most recently updated on April 20th, 2019Streptococcus pneumoniae strains are sensitive to the chemical optochin (ethylhydrocupreine hydrochloride). Optochin sensitivity allows for the presumptive identification of alpha-hemolytic streptococci as S. pneumoniae, although some […]
This post was most recently updated on August 10th, 2016Principle: The bile (sodium deoxycholate) solubility test distinguishes Streptococcus pneumoniae from all other alpha-hemolytic streptococci. Streptococcus pneumoniae is bile soluble whereas all other alpha-hemolytic streptococci are […]
This post was most recently updated on August 10th, 2016Bacitracin is a bactericidal drug useful in the treatment of superficial skin infections but too toxic for systemic use. Bacitracin is a polypeptide antibiotic produced by […]
This post was most recently updated on April 30th, 2019 Coagulase test is used to differentiate Staphylococcus aureus (positive) from Coagulase Negative Staphylococcus (CONS). Coagulase is an enzyme produced by S. aureus that converts (soluble) […]
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