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Immunological Memory01:23

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Related Experiment Video

Updated: Oct 22, 2025

Detection of SARS-CoV-2 Neutralizing Antibodies using High-Throughput Fluorescent Imaging of Pseudovirus Infection
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SARS-CoV-2 persistence in immunocompromised children.

Susan A Dolan1, Jean Mulcahy Levy2,3,4, Angela Moss5

  • 1Department of Epidemiology, Children's Hospital Colorado, Aurora, Colorado, USA.

Pediatric Blood & Cancer
|August 28, 2021
PubMed
Summary
This summary is machine-generated.

Immunocompromised children (ICC) with SARS-CoV-2 often experience prolonged viral shedding, with over 6 weeks of persistence and moderate to high viral loads. This study highlights extended shedding in this vulnerable population.

Keywords:
COVID-19SARS CoV-2immunocompromisedpediatricssheddingviral persistence

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Area of Science:

  • Pediatric Infectious Diseases
  • Virology
  • Immunocompromised Host Research

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection poses unique challenges for immunocompromised children (ICC).
  • Understanding viral persistence duration and viral load in ICC is crucial for clinical management and infection control.

Purpose of the Study:

  • To evaluate the duration of SARS-CoV-2 positivity in ICC.
  • To identify factors associated with prolonged viral shedding.
  • To assess viral load using cycle threshold (CT) values in ICC with persistent SARS-CoV-2 infection.

Main Methods:

  • Retrospective cohort study of 91 ICC from March 2020 to March 2021.
  • Defined immunocompromised status based on medical comorbidities or immunosuppressive treatment.
  • Primary outcome: time to two consecutive negative SARS-CoV-2 PCR tests (≥24 hours apart).
  • Utilized CDC's real-time RT-PCR assay for specimen testing.

Main Results:

  • Median time to two negative tests was 42 days (IQR 25.0-55.0).
  • No significant differences in shedding duration based on illness presentation or immunosuppression level.
  • Five of seven (71%) children with serial testing had initial CT values <30 (moderate to high viral load).
  • Four children showed persistent CT values <30 for 3-4 weeks, indicating sustained moderate to high viral loads.

Conclusions:

  • Most ICC with SARS-CoV-2 experience mild disease but exhibit prolonged viral shedding (>6 weeks).
  • Persistent moderate to high viral loads were observed in a subset of ICC.
  • Findings underscore the need for careful monitoring of viral clearance in immunocompromised pediatric populations.