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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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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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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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Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
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Healthcare Associated Infections II: Preventive Measures01:22

Healthcare Associated Infections II: Preventive Measures

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Essential infection prevention measures are based on the knowledge of the infection chain, the modes of transmission in healthcare settings, and the use of the best practices in all healthcare settings. Compulsory public reporting of healthcare-associated infection rates is needed to allow individuals and the community to make informed choices regarding selecting a healthcare facility.
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Related Experiment Video

Updated: Jan 24, 2026

Development of a Larval Zebrafish Infection Model for Clostridioides difficile
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Enterotoxic Clostridia: Clostridioides difficile Infections.

S Mileto1, A Das1, D Lyras1

  • 1Infection and Immunity Program, Monash Biomedicine Discovery Institute and Department of Microbiology, Monash University, Clayton, Victoria, Australia, 3800.

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Clostridioides difficile (CDI) causes antibiotic-associated diarrhea in humans and animals. This review covers CDI diagnosis, toxins, host response, and treatment strategies for this evolving pathogen.

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A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection
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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Gastroenterology

Background:

  • Clostridioides difficile is a major cause of nosocomial diarrhea.
  • Infection involves spore ingestion, germination, and disruption of gut microbiota.
  • Disease severity ranges from mild to life-threatening.

Purpose of the Study:

  • To provide an overview of Clostridioides difficile infection (CDI).
  • To discuss diagnostic tests, strain typing, and pathogenesis.
  • To review host immune responses, animal models, and treatment strategies.

Main Methods:

  • Literature review of Clostridioides difficile research.
  • Analysis of diagnostic methods and strain typing techniques.
  • Examination of toxin mechanisms and host immune responses.

Main Results:

  • C. difficile toxins TcdA and TcdB disrupt host cell GTPases, causing cell damage.
  • Strain diversity and epidemic strains like ribotype 027 complicate disease.
  • Understanding of CDI pathogenesis and epidemiology is continually evolving.

Conclusions:

  • Effective diagnosis, strain identification, and understanding toxin activity are crucial for managing CDI.
  • Host immune responses and animal models inform treatment and prevention.
  • Current treatment and prevention strategies are essential for combating CDI.