Staphylococcus aureus- An Overview

Staphylococcus aureus

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 the nose / the anterior nares. They can also be … Read more

Biochemical Test of Bacteria

Biochemical Test of Bacteria

Biochemical reactions are very important 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, oxidase, urease, gelatinase, etc., produced by the bacteria. Different … Read more

Baird Parker Agar

Baird Parker Agar

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. Sodium pyruvate was … Read more

Methicillin Resistant Staphylococcus aureus (MRSA)

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 for the cell wall synthesis of bacteria. β lactam drugs … Read more

Mannitol Salt Agar (MSA)

Results on Mannitol Salt Agar (MSA)

Introduction of Mannitol Salt Agar (MSA) 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 enumeration of coagulase-positive Staphylococci in … Read more

Aerobic and Facultatively Anaerobic Gram-Positive Cocci

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: bacteremia, endocarditis, pneumonia, empyema, osteomyelitis, septic arthritis Toxin-mediated infections: toxic … Read more

Biochemical Test of Staphylococcus aureus

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 Positive (+ve) H2S Negative (-ve) Hemolysis Positive (+ve)- Beta Indole … Read more