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Introduction to the Human Microbiota01:22

Introduction to the Human Microbiota

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Microorganisms colonize various regions of the human body, including the mouth, nasal passages, throat, stomach, intestines, urogenital tract, and skin. The total number of microbial cells is estimated to range from 10¹³ to 10¹⁴—comparable to, or exceeding, the number of human somatic cells. This host–microbiome relationship has led to the conceptualization of humans as supraorganisms, wherein microbial communities perform vital roles in development, immunity,...
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Colonisation of Pathogens01:25

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Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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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.
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Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
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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...
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Determination of Biofilm Initiation on Virus-infected Cells by Bacteria and Fungi
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Can we understand modern humans without considering pathogens?

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  • 1IRD, MIVEGEC (UMR CNRS/IRD/UM1) Montpellier Cedex 5, France.

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Summary
This summary is machine-generated.

Human evolution has been shaped by constant pathogen exposure, influencing traits like fertility and behavior. Understanding these evolutionary interactions is key to current health challenges and parasite eradication impacts.

Keywords:
behavior/social evolutionevolutionary medicinehost parasite interactionslife history evolutionnatural selection and contemporary evolutionparasitology

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Area of Science:

  • Evolutionary biology
  • Human evolution
  • Parasitology

Background:

  • Humankind has co-evolved with pathogens throughout history.
  • Cultural shifts like agriculture and domestication increased parasitic exposure and epidemics.

Purpose of the Study:

  • To review phenotypic traits influenced by the parasitic human environment.
  • To discuss the implications for current global health issues and parasite control.

Main Methods:

  • Literature review of evolutionary interactions between humans and parasites.
  • Analysis of proposed phenotypic trait modifications due to parasitic pressure.

Main Results:

  • Numerous human phenotypic traits may be affected by parasitic pressure, including fertility, birth weight, and behavior.
  • Evolutionary parasite-host interactions offer insights into contemporary health problems.

Conclusions:

  • The study of human-parasite evolutionary dynamics is a growing field, crucial for understanding health.
  • Knowledge of these interactions informs predictions about the long-term effects of parasite eradication.