Streptococcus pneumoniae

Bile Solubility Test: Introduction, Principle, Test Requirements, Procedure, Result-Interpretation, and Keynotes

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Bile Solubility Test- Positive and Negative

Introduction of Bile Solubility Test Bile solubility test uses for presumptive identification of Streptococcus pneumoniae. Principle of Bile Solubility Test Bile salts, specifically sodium deoxycholate and sodium taurocholate, have the capacity to selectively lyse Streptococcus pneumoniae when added to actively growing bacteria in agar or broth media. S. pneumoniae produces autolytic …

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Optochin Susceptibility Test: Introduction, Principle, Test Requirements, Procedure, Result-Interpretation, and Keynotes

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Optochin Susceptibility Test-Positive

Optochin Susceptibility Test Optochin Susceptibility Test uses for presumptive identification of Streptococcus pneumoniae from viridans streptococci.  Principle of Optochin Susceptibility Test Ethylhydrocupreine hydrochloride (Optochin), a quinine derivative, selectively inhibits the growth of S. pneumoniae at a very low concentration (5ug/ml). Optochin may also inhibit other viridians streptococci, but only …

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Some Typical Arrangements of Bacteria: List, Keynotes, and, Few Related Images

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Some Typical Shape, Size and Arrangements of Bacteria

List of Some Typical Arrangements of Bacteria In this chapter, we discuss some typical arrangements of bacteria like Staphylococcus, Streptococcus, pneumococcus, Enterococcus, Micrococcus, Neisseria species, Bacillus anthracis, Diphtheroids, Corynebacterium diphtheriae, Listeria monocytogenes, Vibrio cholerae, Campylobacter, Helicobacter, Treponema, Leptospira, Borrelia, etc. S.No. Arrangements  Organisms 1. Gram-positive cocci …

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Gram Positive Cocci (GPC): Introduction, and List of Bacteria, Keynotes, and Related Images

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Introduction of Gram Positive Cocci ‘Gram Positive Cocci (GPC)‘ bacteria retain crystal violet dye and stain blue or purple on Gram’s staining. The most common medically important bacteria of GPC are Staphylococcus aureus, Streptococcus pneumoniae, Enterococcus species, Streptococcus pyogenes, Streptococcus agalactiae and Staphylococcus saprophyticus. List …

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Gram-Positive Bacteria Identification: Introduction, List of Common Bacteria, and Identification Keys

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Staphylococcus aureus colony characteristics on Blood Agar-Golden yellow colony

Introduction of Gram-Positive Bacteria Identification Identification of Gram-positive bacteria is a little bit harder than Gram-negative bacteria since the most common bacterial etiological agents are Gram-negative bacteria and the vendors or suppliers are directly involved in supplying common tests reagents and test kit accessories. Due …

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Bacteria-wise Antimicrobial Susceptibility Testing (AST): Introduction, List of Bacterial Panel, Antibiotics

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Bacteria wise Antimicrobial Susceptibility Testing (AST): Introduction, List of Bacterial Panel, Antibiotics

Introduction of Bacteria-wise Antimicrobial Susceptibility Testing (AST) All antimicrobial agents/ antibiotics are not applicable for all bacteria and for this reason, we should follow organism-wise antibiotics policy. As we know, antimicrobial resistance (AMR) is increasing day by day but no new antibiotic has not been …

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