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Related Concept Videos

Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

Nonlinear Pharmacokinetics: Michaelis-Menten Equation

554
The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...
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Nonlinear Pharmacokinetics: Causes of Nonlinearity01:22

Nonlinear Pharmacokinetics: Causes of Nonlinearity

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Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
Nonlinear drug absorption can occur when the process is rate-limited by solubility, carrier-mediated transport systems, or saturation of the presystemic gut wall or hepatic metabolism. For instance, high doses of riboflavin...
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Updated: Sep 28, 2025

Author Spotlight: A Pseudotype Virus System for Assessing Omicron Subvariants and Neutralizing Antibodies in SARS-CoV-2 Research
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Variant-specific SARS-CoV-2 within-host kinetics.

Baptiste Elie1, Bénédicte Roquebert2, Mircea T Sofonea1

  • 1MIVEGEC, CNRS, IRD, Université de Montpellier, Montpellier, France.

Journal of Medical Virology
|April 4, 2022
PubMed
Summary
This summary is machine-generated.

The Alpha variant of SARS-CoV-2 showed higher viral loads and slower decay than older strains, increasing transmission potential, especially in the elderly. No significant difference was found between Alpha and Delta variants in peak viral load.

Keywords:
SARS-Cov2ddPCRvariant of concernviral dynamicswithin-host

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Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • SARS-CoV-2 variants of concern (VOCs) have driven epidemic resurgences globally since early 2021.
  • Within-host viral dynamics contributing to VOC transmissibility remain inadequately understood.
  • Epidemiological data often lacks detailed within-host viral load information.

Purpose of the Study:

  • To investigate within-host viral kinetics of SARS-CoV-2 VOCs.
  • To correlate viral load with transmission potential.
  • To compare viral dynamics between Alpha, Delta, and historical SARS-CoV-2 lineages.

Main Methods:

  • Analysis of a longitudinal cohort of 6944 individuals with 14,304 RT-qPCR Ct values from France (Feb-Aug 2021).
  • Conversion of Ct values to viral genome copies using droplet digital PCR (ddPCR).
  • Comparison of viral load kinetics (peak, decay rate) and transmission potential across different VOCs.

Main Results:

  • Alpha variant infections exhibited higher peak viral genome copies and slower decay compared to historical lineages.
  • Alpha variant's viral kinetics correlated with significantly higher transmission potentials, particularly in older adults.
  • No significant difference in peak viral copy number was observed between Alpha and Delta variant infections.

Conclusions:

  • Within-host viral load variations contribute to observed differences in SARS-CoV-2 variant transmissibility.
  • The Alpha variant's distinct viral kinetics enhance its transmission potential.
  • Viral load dynamics provide insights into the epidemiological success of different SARS-CoV-2 variants.