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Related Concept Videos

Influenza01:27

Influenza

51
Influenza is an acute, highly communicable viral disease that affects the respiratory tract and is responsible for seasonal epidemics worldwide. Influenza A is the most prevalent type associated with widespread outbreaks and is subtyped based on two surface glycoproteins: hemagglutinin (H) and neuraminidase (N), as in H1N1. These glycoproteins are essential for viral infectivity, transmission, and immune recognition. Transmission occurs primarily through respiratory droplets and contaminated...
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Factors Affecting the Risk of Infection01:26

Factors Affecting the Risk of Infection

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The hosts' susceptibility to infection depends on several factors. The integrity of the skin and mucous membranes helps protect the body against microbial attacks. When the skin is altered, the chance of infection, limb loss, and even death increases.
The integrity and count of the white blood cells help the body resist pathogens and fight infection. When impaired, it reduces the body's resistance to pathogens. The acidic pH levels of the gastrointestinal, genitourinary tracts, and skin...
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Stages of Infection01:26

Stages of Infection

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Vaccinations01:51

Vaccinations

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Overview
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Immunodeficiency Diseases01:25

Immunodeficiency Diseases

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency...
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Infectious Diseases and Their Occurrence01:28

Infectious Diseases and Their Occurrence

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Infectious diseases appear in populations through various transmission patterns, influenced by pathogen characteristics, population immunity, environmental conditions, and social behavior. Understanding these patterns is essential for effective public health surveillance and intervention. These categories—sporadic, outbreak, epidemic, pandemic, and endemic—help frame the nature and scope of disease events.Sporadic diseases occur irregularly and infrequently, without a predictable...
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    Area of Science:

    • Virology
    • Immunology
    • Mathematical Biology

    Background:

    • Influenza pathogenesis involves complex interactions between viral replication, host immunity, and symptoms.
    • Existing models often lack a mechanistic link between immune activity and disease severity.

    Purpose of the Study:

    • To develop an integrated within-host model connecting influenza infection dynamics, immune responses, and symptom severity.
    • To identify key immune mediators of symptom progression and explore age-dependent effects.

    Main Methods:

    • Developed a unified dynamical system integrating viral kinetics, immune components, and symptom manifestation (weight loss).
    • Utilized murine influenza data to parameterize and analyze the model.
    • Investigated the role of inflammatory signaling, specifically TNF-α pathways.

    Main Results:

    • Identified inflammatory signaling, particularly TNF-α, as a crucial link between immune response and symptom severity.
    • Demonstrated that age-related immune dysregulation amplifies symptom burden despite similar viral loads.
    • Showcased that disease severity is a product of immune regulation and host physiology dynamics.

    Conclusions:

    • Influenza disease severity is determined by the interplay of immune regulation and host physiology, not solely viral load.
    • Age-dependent immune alterations significantly impact symptom severity through prolonged inflammation.
    • The developed framework aids in understanding age-specific morbidity and designing targeted immunomodulatory interventions.