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Related Concept Videos

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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Rheumatic Heart Disease I: Introduction01:23

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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
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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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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.
The best practices for preventing healthcare-associated infections include hand hygiene, patient risk...
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Endocarditis I: Introduction01:25

Endocarditis I: Introduction

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Introduction:Endocarditis is the infection of the endocardium, the inner lining of the heart and its valves. When the heart muscle is involved, the condition is termed myocarditis, while an infection of the outer lining is called pericarditis. Infective endocarditis (IE) primarily affects the endocardium, where pathogens adhere to the valves or lining, forming vegetation that can lead to severe complications. Infective endocarditis occurs when microorganisms, usually bacteria from other body...
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Infection01:20

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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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Updated: Aug 3, 2025

A Murine Model of Group B Streptococcus Vaginal Colonization
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Group A Streptococcus Is Still at Large.

Qinghua Lu1,2, Dingle Yu1,2, Yonghong Yang1,2

  • 1Microbiology Laboratory, Beijing Pediatric Research Institute, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China.

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Group A Streptococcus (GAS) causes mild to severe diseases. Understanding GAS pathogenesis is crucial for developing effective treatments against this significant human pathogen.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Pathogen Research

Background:

  • Group A Streptococcus (GAS) is a significant human pathogen responsible for a spectrum of diseases.
  • GAS infections range from superficial pharyngitis to severe invasive conditions like necrotizing fasciitis and streptococcal toxic shock syndrome.

Discussion:

  • GAS pathogenesis involves complex interactions between bacterial virulence factors and host immune responses.
  • Understanding the molecular mechanisms underlying GAS virulence is essential for combating its diverse clinical manifestations.

Key Insights:

  • GAS possesses a repertoire of virulence factors that contribute to its ability to evade host defenses and cause disease.
  • Identifying critical GAS virulence factors and their roles in infection provides targets for therapeutic intervention.

Outlook:

  • Further research into GAS virulence and host-pathogen interactions will facilitate the development of novel vaccines and antimicrobial strategies.
  • Continued investigation into GAS epidemiology and resistance patterns is vital for public health surveillance and management.