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Related Concept Videos

Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Antiviral Nucleoside Inhibitors01:22

Antiviral Nucleoside Inhibitors

Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...
Herpes01:28

Herpes

Herpes simplex type 1 (HSV‑1) is a widespread pathogen responsible for orolabial lesions. It is an enveloped, double-stranded DNA (dsDNA) virus belonging to the family Herpesviridae. Once the virus infects a host cell, its double‑stranded DNA genome is delivered into the nucleus, where a coordinated cascade of immediate‑early, early, and late gene expression directs viral DNA replication, structural protein synthesis, and virion assembly. After primary infection of epithelial cells, HSV-1...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...

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Related Experiment Video

Updated: Jun 27, 2026

Humanized NOD/SCID/IL2rγnull (hu-NSG) Mouse Model for HIV Replication and Latency Studies
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Humanized NOD/SCID/IL2rγnull (hu-NSG) Mouse Model for HIV Replication and Latency Studies

Published on: January 7, 2019

Within-host virus models with periodic antiviral therapy.

Patrick De Leenheer1

  • 1Department of Mathematics, University of Florida, Gainesville, USA. deleenhe@math.ufl.edu

Bulletin of Mathematical Biology
|December 17, 2008
PubMed
Summary

Periodic drug treatment can eradicate viruses within the host. This study identifies effective drugs and combinations, optimizing for efficacy and patient safety, using an HIV model for illustration.

Area of Science:

  • Mathematical biology
  • Virology
  • Pharmacology

Background:

  • Within-host viral dynamics are complex.
  • Understanding the impact of periodic drug therapy is crucial for treatment efficacy.
  • Current models require refinement to incorporate periodic treatment regimens.

Purpose of the Study:

  • To investigate the impact of periodic drug treatment on within-host viral models.
  • To identify conditions and drug characteristics for successful viral eradication.
  • To optimize treatment strategies considering both efficacy and toxicity.

Main Methods:

  • Development and analysis of a standard within-host virus model with periodic therapy.
  • Theoretical characterization of successful drug regimens.

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Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

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Last Updated: Jun 27, 2026

Humanized NOD/SCID/IL2rγnull (hu-NSG) Mouse Model for HIV Replication and Latency Studies
07:10

Humanized NOD/SCID/IL2rγnull (hu-NSG) Mouse Model for HIV Replication and Latency Studies

Published on: January 7, 2019

Oral Combinational Antiretroviral Treatment in HIV-1 Infected Humanized Mice
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Oral Combinational Antiretroviral Treatment in HIV-1 Infected Humanized Mice

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Early Viral Entry Assays for the Identification and Evaluation of Antiviral Compounds

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  • Numerical simulations and optimization techniques.
  • Application to a human immunodeficiency virus (HIV) model.
  • Main Results:

    • Viral eradication is achievable with periodic drug regimens.
    • Quantitative criteria for effective drugs or drug combinations were established.
    • Optimization problems related to treatment efficacy and toxicity were simplified and solved.
    • Numerical examples using current HIV model parameters demonstrated the findings.

    Conclusions:

    • Periodic drug therapy offers a viable strategy for viral eradication.
    • The study provides a framework for identifying and optimizing antiviral treatments.
    • The findings are directly applicable to improving HIV treatment regimens.