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Related Concept Videos

Infection01:20

Infection

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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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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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Sexually Transmitted Infections01:26

Sexually Transmitted Infections

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Sexually transmitted infections (STIs) are diseases transmitted primarily through unsafe sexual interactions. Bacteria, viruses, or parasites cause them and can result in severe health complications if untreated.ChlamydiaThe bacterium Chlamydia trachomatis is responsible for the disease Chlamydia, the most common STI in the United States. This peculiar pathogen requires human cells to reproduce, residing intracellularly. The initial infection often goes unnoticed because it typically does not...
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Endocarditis II: Clinical Features of Infective Endocarditis01:25

Endocarditis II: Clinical Features of Infective Endocarditis

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Endocarditis can present various clinical features depending on the causative organism and the patient's underlying health conditions. Initially, the clinical features of infective endocarditis develop gradually, presenting with nonspecific symptoms that can be easily mistaken for other illnesses.General SymptomsEarly symptoms of infective endocarditis are fever, chills, weakness, malaise, fatigue, and weight loss. These symptoms reflect the systemic nature of the infection and the body's...
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Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

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Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
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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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Updated: Dec 18, 2025

Systemic Bacterial Infection and Immune Defense Phenotypes in Drosophila Melanogaster
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Systemic Bacterial Infection and Immune Defense Phenotypes in Drosophila Melanogaster

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Infectious without symptoms.

Graham Lawton

    New Scientist (1971)
    |June 11, 2020
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    Summary
    This summary is machine-generated.

    The virus spreads easily even when people feel healthy. Understanding asymptomatic transmission is key to controlling its spread and protecting public health.

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    Area of Science:

    • Virology
    • Epidemiology
    • Public Health

    Background:

    • Viral infections can be transmitted by individuals who are unaware they are infected.
    • Asymptomatic transmission poses a significant challenge to disease control efforts.

    Purpose of the Study:

    • To highlight the ease of viral spread from individuals without symptoms.
    • To emphasize the importance of recognizing and managing asymptomatic cases in public health strategies.

    Main Methods:

    • This study is a review of current scientific understanding.
    • It synthesizes findings from epidemiological data and virological studies.

    Main Results:

    • Viral shedding can occur before the onset of symptoms, facilitating silent transmission.
    • A significant portion of infections may be spread by individuals who never develop symptoms.

    Conclusions:

    • Effective control of viral outbreaks requires strategies that account for asymptomatic spread.
    • Public health messaging should address the risk posed by individuals who are unknowingly infected.