Staphylococcus aureus- An Overview
Image Source: ASM and Bacteria in Photos. Habitat of Staphylococcus aureus The natural habitat is mammalian body surfaces. They are normal flora of the skin and mucous membrane. Also present in … Read more
Staphylococcus aureus
Biochemical Test and Identification of Bacteria
Biochemical reactions are significant in the identification of bacterial isolates and in the identification of different bacterial species. These tests depend on the presence of certain enzymes, such as catalase, … Read more
Methicillin Resistant Staphylococcus aureus (MRSA)
MRSA is mediated by the mecA gene; which is chromosomally coded. It alters penicillin-binding protein (PBP) present on S. aureus cell membrane to PBP-2a: PBP is an essential protein needed … Read more
Aerobic and Facultatively Anaerobic Gram-Positive Cocci
Enterococcus faecalis and Enterococcus faecium Clinical Features Urinary tract infections, peritonitis, bacteremia, endocarditis Virulence Factors Relatively avirulent Staphylococcus aureus Clinical Features Suppurative infections: impetigo, folliculitis, furuncles, carbuncles, wounds Disseminated infections: … Read more
Biochemical Test of Staphylococcus aureus
Biochemical Test of Staphylococcus aureus Basic Characteristics Properties (Staphylococcus aureus) Capsule Non-Capsulated Catalase Positive (+ve) Citrate Positive (+ve) Coagulase Positive (+ve) Gas Negative (-ve) Gelatin Hydrolysis Positive (+ve) Gram Staining … Read more
Coagulase Test- Principle, Procedure, Types, Result, Uses
A coagulase test is a biochemical test that is used to differentiate Staphylococcus aureus from other Staphylococci species like S. epidermidis and S. saprophyticus on the basis of the ability … Read more
Catalase Test- Principle, Procedure, Types, Results, Uses
The catalase test is a biochemical test for aerobic organisms that detects the production of catalase enzyme in the organism. Catalase enzyme is a common enzyme that is found in … Read more
Baird Parker Agar- Composition, Principle, Preparation, Results, Uses
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 … Read more
Mannitol Salt Agar (MSA)- Composition, Principle, Preparation, Results, Uses
Mannitol Salt Agar (MSA) is used as a selective and differential medium for the isolation and identification of Staphylococcus aureus from clinical and non-clinical specimens. It is recommended for the detection and … Read more
Staphylococcal food poisoning (SFP)- Staphylococcus aureus enterotoxins
Staphylococcal food poisoning (SFP) is one of the most probably occurring food-borne diseases which cause intoxication from the consumption of food containing preformed staphylococcal enterotoxins (SEs). Staphylococcal enterotoxins are mainly … Read more