Is Aspergillus catalase positive?
Many bacteria are catalase positive, but some are better catalase-producers than others. The mnemonic can be used to memorise the catalase-positive bacteria (and Candida and Aspergillus, which are fungi): nocardia, pseudomonas, listeria, aspergillus, candida, E. coli, staphylococcus, serratia, B.
Is Clostridium catalase positive or negative?
For the identification of anaerobic bacteria, a 15% H2O2 solution is necessary (1). In this context, the catalase test is used to differentiate aerotolerant strains of Clostridium, which are catalase negative, from Bacillus species, which are positive (8).
Are Streptococcus catalase negative?
Gram-positive cocci include Staphylococcus (catalase-positive), which grows clusters, and Streptococcus (catalase-negative), which grows in chains. The staphylococci further subdivide into coagulase-positive (S.
Is Enterococcus Gram-positive or negative?
Enterococci are Gram-positive facultative anaerobic cocci in short and medium chains, which cause difficult to treat infections in the nosocomial setting. They are a common cause of UTI, bacteremia, and infective endocarditis and rarely cause intra-abdominal infections and meningitis.
Is Enterococcus faecalis indole positive or negative?
Biochemical Test and Identification of Enterococcus faecalis
| Characteristics | Enterococcus faecalis |
|---|---|
| VP | Positive (+ve) |
| OF (Oxidative/Fermentative) | – |
| Indole | Negative (-ve) |
| Citrate | Negative (-ve) |
What bacteria is positive for catalase test?
If no bubbles appear, the bacteria are catalase negative. Staphylococcus and Micrococcus spp. are catalase positive, whereas Streptococcus and Enterococcus spp. are catalase negative.
Why is Staphylococcus catalase positive?
Catalase is an enzyme that converts hydrogen peroxide to water and oxygen gas. The test is easy to perform; bacteria are simply mixed with H 2O 2. If bubbles appear (due to the production of oxygen gas) the bacteria are catalase positive.
What types of bacteria are catalase positive?
Staphylococcus and Micrococcus spp. are catalase positive, whereas Streptococcus and Enterococcus spp. are catalase negative.
Is strep gram positive or negative?
Structure. Streptococci are Gram-positive, nonmotile, nonsporeforming, catalase-negative cocci that occur in pairs or chains.
