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Related Concept Videos

Coronavirus01:29

Coronavirus

Coronaviruses, including the severe acute respiratory syndrome coronavirus (SARS-CoV), are enveloped viruses characterized by their single-stranded, positive-sense RNA genome and helical nucleocapsid structure. The hallmark of these viruses is their club-shaped spike (S) glycoproteins that protrude from the viral envelope, facilitating attachment to host cells. Typically, coronaviruses infect the upper respiratory tract, often causing mild or asymptomatic disease. However, certain strains like...
Single Nucleotide Polymorphisms-SNPs01:05

Single Nucleotide Polymorphisms-SNPs

A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
Relative Risk01:12

Relative Risk

Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...
Respiratory Syncytial Virus Disease01:29

Respiratory Syncytial Virus Disease

Human respiratory syncytial virus (RSV) is a widespread pathogen that primarily targets infants and young children but also poses a serious health risk to elderly and immunocompromised individuals. Belonging to the Pneumoviridae family, RSV is a negative-sense, single-stranded RNA virus within the Pneumovirus genus. Its global health burden is significant, with millions of cases annually resulting in hospitalizations and mortality, particularly in resource-limited settings. Although most...
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...

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Related Experiment Video

Updated: Jun 5, 2026

Quantification and Whole Genome Characterization of SARS-CoV-2 RNA in Wastewater and Air Samples
09:26

Quantification and Whole Genome Characterization of SARS-CoV-2 RNA in Wastewater and Air Samples

Published on: June 30, 2023

Routine SARS-CoV-2 testing frequency and risk of severe COVID-19: A nationwide population-based study.

Laith J Abu-Raddad1, Houssein H Ayoub2, Peter Coyle3

  • 1Infectious Disease Epidemiology Group, Weill Cornell Medicine-Qatar, Cornell University, Doha, Qatar; Department of Population Health Sciences, Weill Cornell Medicine, Cornell University, New York, New York, USA; Department of Public Health, College of Health Sciences, QU Health, Qatar University, Doha, Qatar; College of Health and Life Sciences, Hamad bin Khalifa University, Doha, Qatar.

International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases
|June 3, 2026
PubMed
Summary

Higher routine testing for SARS-CoV-2 (the virus that causes COVID-19) did not reduce the risk of severe illness. This suggests a more targeted approach to testing resources may be beneficial for individuals.

Keywords:
Case-controlEpidemiologyHospitalizationMorbidityMortalityTesting frequency

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Efficient SARS-CoV-2 Quantitative Reverse Transcriptase PCR Saliva Diagnostic Strategy utilizing Open-Source Pipetting Robots
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Last Updated: Jun 5, 2026

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Efficient SARS-CoV-2 Quantitative Reverse Transcriptase PCR Saliva Diagnostic Strategy utilizing Open-Source Pipetting Robots
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Efficient SARS-CoV-2 Quantitative Reverse Transcriptase PCR Saliva Diagnostic Strategy utilizing Open-Source Pipetting Robots

Published on: February 11, 2022

Area of Science:

  • Epidemiology
  • Public Health
  • Infectious Disease Research

Background:

  • Routine testing for SARS-CoV-2 is a key public health strategy.
  • The relationship between testing frequency and COVID-19 severity outcomes requires further investigation.

Purpose of the Study:

  • To assess if increased routine testing frequency for SARS-CoV-2 correlates with a lower risk of severe, critical, or fatal COVID-19.

Main Methods:

  • A nationwide matched case-control study in Qatar (February 2020–December 2021).
  • Compared 10,909 severe/critical/fatal COVID-19 cases with 98,811 controls.
  • Used conditional logistic regression to analyze associations between testing frequency and severe outcomes.

Main Results:

  • Higher routine SARS-CoV-2 testing frequency was not associated with reduced odds of severe, critical, or fatal COVID-19.
  • Adjusted odds ratios (aORs) for high vs. low testing frequency were 0.86 (95% CI, 0.74-1.01) and 0.97 (95% CI, 0.88-1.07) in different classifications.
  • Results remained consistent across subgroup and sensitivity analyses.

Conclusions:

  • Increased routine SARS-CoV-2 testing did not lower individual risk for severe COVID-19.
  • Findings support targeted allocation of testing resources.
  • Routine testing remains valuable for case identification and transmission control.