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Related Concept Videos

DNA Bacteriophages01:26

DNA Bacteriophages

Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the lytic replication...
Methods of Classification and Identification01:28

Methods of Classification and Identification

Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
Streptococcal Pharyngitis01:27

Streptococcal Pharyngitis

Streptococcal pharyngitis, commonly known as “strep throat,” is an acute infection of the oropharyngeal tissues caused by the Gram‑positive Group A Streptococcus (Streptococcus pyogenes). Transmission occurs primarily through respiratory droplets expelled during coughing, sneezing, or talking.Mechanisms of Host Entry and Immune EvasionUpon entering the host, S. pyogenes adheres to the mucosal epithelial cells of the pharynx via surface proteins, notably lipoteichoic acid and the antiphagocytic...

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Updated: Jun 11, 2026

Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
08:51

Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)

Published on: November 4, 2016

Phage typing of staphylococci.

J E Blair, R E Williams

    Bulletin of the World Health Organization
    |July 7, 2010
    PubMed
    Summary

    Standardized phage typing methods for staphylococci ensure reliable results across laboratories. This guide details phage propagation, stability testing, and typing techniques for accurate bacterial identification and epidemiological surveillance.

    Area of Science:

    • Microbiology
    • Bacteriology
    • Epidemiology

    Background:

    • Phage typing is crucial for differentiating Staphylococcus strains.
    • Inconsistent methods hinder inter-laboratory comparisons and epidemiological surveillance.
    • Standardization is needed for reliable and reproducible phage typing results.

    Purpose of the Study:

    • To provide standardized methods for phage typing of staphylococci.
    • To ensure reliability and comparability of phage typing results globally.
    • To detail procedures for phage propagation, stability testing, and strain identification.

    Main Methods:

    • Detailed protocols for propagating typing bacteriophages.
    • A standard routine for verifying the stability of phage preparations.

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    Multiplex PCR Assay for Typing of Staphylococcal Cassette Chromosome Mec Types I to V in Methicillin-resistant Staphylococcus aureus

    Published on: September 5, 2013

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    Last Updated: Jun 11, 2026

    Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)
    08:51

    Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR (RS-PCR)

    Published on: November 4, 2016

    Methodology for the Study of Horizontal Gene Transfer in Staphylococcus aureus
    10:39

    Methodology for the Study of Horizontal Gene Transfer in Staphylococcus aureus

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    Multiplex PCR Assay for Typing of Staphylococcal Cassette Chromosome Mec Types I to V in Methicillin-resistant Staphylococcus aureus
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    Published on: September 5, 2013

  • Recommended techniques for determining the phage type of staphylococcal isolates.
  • Guidelines for interpreting phage typing results and strain differentiation.
  • Main Results:

    • Established satisfactory methods for phage propagation.
    • Defined a standard testing routine for phage preparation stability.
    • Outlined recommended methods for staphylococcal phage typing.
    • Discussed the interpretation of phage type differences.

    Conclusions:

    • Standardized phage typing methods are essential for reliable Staphylococcus strain identification.
    • Adherence to defined protocols ensures comparability of results between laboratories.
    • Close collaboration between epidemiologists and laboratory workers is vital for effective use of phage typing.