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Related Concept Videos

Acute Pharyngitis01:30

Acute Pharyngitis

Introduction
Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
Classification
Acute pharyngitis can be categorized based on its underlying cause:
Chronic Pharyngitis01:23

Chronic Pharyngitis

Chronic pharyngitis refers to persistent inflammation of the pharyngial mucosa.
Etiology
It often arises from persistent viral or bacterial infections affecting sinuses and tonsils.
Additional contributing factors include inadequate dental hygiene, mouth breathing, recurring tonsillitis, allergic rhinitis, laryngopharyngeal reflux, and exposure to smoke, chemicals, and other environmental pollutants. Allergic reactions to pollen, mold, and pet dander, chronic cough, excessive voice usage,...
Microbiota of the Respiratory Tract01:29

Microbiota of the Respiratory Tract

The human respiratory tract, comprising the upper and lower segments, serves as a critical interface with the external environment. The upper respiratory tract (URT)—including the nostrils, sinuses, pharynx, and oropharynx—is heavily colonized by microbes, while the lower respiratory tract (LRT), composed of the larynx, trachea, bronchi, and lungs, was long thought to be sterile. However, recent molecular studies have revealed that the lungs are not devoid of microbes but act more like...
Human Virome01:26

Human Virome

The human body harbors a vast and diverse viral community known as the human virome. The virome includes bacteriophages that infect bacteria, and eukaryotic viruses that infect human cells. Transient dietary and environmental viruses also contribute to this dynamic ecosystem. Estimates suggest the human body may contain on the order of 10¹³ viral particles, though abundance varies widely by body site and detection method.Comprehensive characterization of the virome has become possible only with...
Bacteriophages of the Human Virome01:23

Bacteriophages of the Human Virome

Bacteriophages are found throughout the human body. They may even outnumber eukaryotic viruses, forming an important and dynamic component of the human virome. Indeed, phages represent the most abundant viral entities, with densities in the gut reaching up to 10⁹ particles per gram of fecal matter, and many belonging to orders such as Caudovirales and Microviridae, while a substantial proportion remains unclassified as viral “dark matter.”Lysogeny and Genetic ExchangeIn the gut, bacteriophages...
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...

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Related Experiment Video

Updated: Jul 27, 2026

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
09:12

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

Published on: January 17, 2014

Increased pharyngeal bacterial colonization during viral illness

C H Ramirez-Ronda, Z Fuxench-López, M Nevárez

    Archives of Internal Medicine
    |November 1, 1981
    PubMed
    Summary

    Upper respiratory tract infections increase oropharyngeal colonization by Staphylococcus aureus and Gram-negative bacilli (GNB). This transient increase may elevate pneumonia risk, highlighting the importance of monitoring bacterial colonization during illness.

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    Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
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    Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae

    Published on: January 17, 2014

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    12:33

    Determination of Biofilm Initiation on Virus-infected Cells by Bacteria and Fungi

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    A Mouse Model for the Transition of Streptococcus pneumoniae from Colonizer to Pathogen upon Viral Co-Infection Recapitulates Age-Exacerbated Illness
    12:21

    A Mouse Model for the Transition of Streptococcus pneumoniae from Colonizer to Pathogen upon Viral Co-Infection Recapitulates Age-Exacerbated Illness

    Published on: September 28, 2022

    Area of Science:

    • Microbiology
    • Infectious Diseases
    • Clinical Medicine

    Background:

    • Oropharyngeal colonization by pathogens like Staphylococcus aureus and Gram-negative bacilli (GNB) is a known risk factor for infections.
    • Understanding colonization dynamics during illness is crucial for infection prevention strategies.

    Purpose of the Study:

    • To investigate the prevalence and duration of oropharyngeal colonization by S. aureus and GNB in healthcare professionals.
    • To determine if upper respiratory tract infections (URTIs) alter this colonization.

    Main Methods:

    • Biweekly quantitative oropharyngeal cultures were performed over 11 months in 89 house staff officers.
    • Episodes of URTIs were documented, and colonization rates were compared between illness-free and URTI periods.

    Main Results:

    • Baseline GNB colonization ranged from 12-18%; S. aureus colonization ranged from 5-14%.
    • During URTIs, GNB colonization increased to 60% and S. aureus to 43%.
    • Increased colonization was transient, lasting approximately two weeks.

    Conclusions:

    • URTIs significantly increase oropharyngeal colonization by S. aureus and GNB.
    • This transient increase in bacterial colonization during URTIs may contribute to the heightened risk of pneumonia.