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Related Concept Videos

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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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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Intracellular Movement of Viruses and Bacteria01:10

Intracellular Movement of Viruses and Bacteria

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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Masking and Demasking Agents01:19

Masking and Demasking Agents

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EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
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Surface Membrane Barriers01:18

Surface Membrane Barriers

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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
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Related Experiment Video

Updated: Nov 6, 2025

Contact-Free Co-Culture Model for the Study of Innate Immune Cell Activation During Respiratory Virus Infection
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A Borderless Solution Is Needed for A Borderless Complexity, Like COVID-19, the Universal Invader.

Kawthar Mohamed1,2, Rangarirai Makuku1,3, Eduardo Rodríguez-Román4,5

  • 1School of Medicine, Tehran University of Medical sciences, Tehran, Iran.

Advances in Experimental Medicine and Biology
|May 11, 2021
PubMed
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The COVID-19 pandemic caused widespread issues, including ineffective distancing, economic hardship, and mental health crises. Global efforts to combat the virus individually hinder a unified resolution.

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Area of Science:

  • Global Health
  • Epidemiology
  • Public Health Policy

Background:

  • The COVID-19 pandemic presented unprecedented global challenges.
  • Ineffectiveness of non-pharmaceutical interventions like social distancing was observed.
  • Significant economic and mental health repercussions were documented worldwide.

Purpose of the Study:

  • To outline the multifaceted complexities arising from the COVID-19 pandemic.
  • To highlight the global impact on health, economy, and well-being.
  • To identify barriers to effectively ending the pandemic.

Main Methods:

  • A descriptive approach was employed to review the pandemic's impact.
  • Analysis of challenges in vaccine and therapeutic development.
  • Examination of diagnostic limitations.

Main Results:

  • The pandemic's effects spanned public health, economic stability, and mental wellness.
  • Development of effective vaccines and treatments faced significant hurdles.
  • Accurate and rapid diagnosis remained a persistent challenge.

Conclusions:

  • The COVID-19 pandemic's intricate nature demands comprehensive global strategies.
  • Individualized national responses have proven insufficient in overcoming the crisis.
  • International cooperation is essential for achieving a conclusive and peaceful end to the pandemic.