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Related Concept Videos

Viral Recombination00:57

Viral Recombination

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.
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Subviral Agents01:29

Subviral Agents

Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
Production of Biopesticides01:18

Production of Biopesticides

Biopesticides offer a sustainable alternative to chemical pesticides, utilizing microbial agents to control agricultural pests. Bacillus thuringiensis (Bt) is a widely employed bacterium known for its potent insecticidal activity. Bt biopesticides are favored for their specificity to insect pests, minimal environmental impact, and natural degradability.Mechanism of Bt Toxin Action Bt produces insecticidal crystal (Cry) proteins during its sporulation phase. These proteins form parasporal...
Introduction to Virus01:28

Introduction to Virus

Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...

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Updated: Jun 14, 2026

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 2. General Practices
08:53

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 2. General Practices

Published on: October 3, 2016

[Viral biosafety, biosecurity, and bioterrorism].

D Garin1

  • 1Institut de Recherche Biomédicale des Armées (IRBA), division expertise infrastructure, Brétigny sur Orge. Daniel.Garin@wanadoo.fr

Medecine Tropicale : Revue Du Corps De Sante Colonial
|March 27, 2010
PubMed
Summary

Intentional release of infectious agents, particularly viruses, poses a significant bioterrorism threat. Handling these dangerous biological agents requires specialized biocontainment laboratories classified by risk level.

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Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 3. Aerobiology
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Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 3. Aerobiology

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Last Updated: Jun 14, 2026

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 2. General Practices
08:53

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 2. General Practices

Published on: October 3, 2016

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 1. Biosafety Level 4 Suit Laboratory Suite Entry and Exit Procedures
09:54

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 1. Biosafety Level 4 Suit Laboratory Suite Entry and Exit Procedures

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Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 3. Aerobiology
11:13

Safety Precautions and Operating Procedures in an (A)BSL-4 Laboratory: 3. Aerobiology

Published on: October 3, 2016

Area of Science:

  • Virology
  • Biosecurity
  • Public Health

Context:

  • The deliberate release of infectious agents, including viruses, is a recognized security threat, escalating from wartime applications to small-scale terrorist acts.
  • Viruses, especially those of tropical origin, present unique biological hazards due to their high infectivity, host adaptability, diagnostic challenges, and lack of specific treatments.
  • The increasing risk necessitates stringent safety protocols for handling dangerous biological agents.

Purpose:

  • To discuss the classification modalities for biocontainment laboratories handling infectious agents.
  • To highlight the specific risks associated with viral agents in the context of bioterrorism.
  • To underscore the importance of specialized laboratory infrastructure for managing biological threats.

Summary:

  • Intentional release of infectious agents, particularly viruses, is a growing concern for bioterrorism.
  • Viruses pose significant hazards due to infectivity, adaptability, diagnostic difficulty, and treatment limitations.
  • Proper classification of biocontainment laboratories (up to level 4) is crucial for managing these risks.

Impact:

  • Informs the development and implementation of robust biosecurity measures.
  • Guides the design and classification of high-containment laboratories.
  • Enhances preparedness against bioterrorism threats involving infectious agents.