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Hidden SARS-CoV-2 Omicron Infections in Young Children: What Routine Tests Do Not Tell.

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This summary is machine-generated.

Routine PCR tests for COVID-19 in young children show low sensitivity, missing many infections. This challenges current screening protocols for asymptomatic children, especially those recently recovered from SARS-CoV-2.

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COVID-19 testingclinical practice guidelinelymphoid tissuepediatricspredictive value of tests

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Area of Science:

  • Pediatric Infectious Diseases
  • Diagnostic Accuracy
  • Epidemiology

Background:

  • The COVID-19 pandemic necessitated varied screening protocols, complicated by different variants and challenging implementation in young children.
  • Routine polymerase chain reaction (PCR) testing is a primary screening method, but its accuracy in pediatric populations requires evaluation.

Purpose of the Study:

  • To assess the diagnostic accuracy of routine PCR testing for severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) in young children.
  • To identify SARS-CoV-2 Omicron infections missed by routine PCR and compare multiple testing modalities.

Main Methods:

  • A prospective cohort study involving 55 children aged ≤ 6 years undergoing adenoidectomy/tonsillotomy.
  • Comparison of preoperative PCR with intraoperative rapid antigen tests, separate naso/oropharyngeal PCR swabs, tissue PCR, and serological tests.

Main Results:

  • Routine preoperative PCR had a sensitivity of only 20% compared to tissue PCR.
  • Intraoperative PCR screening achieved 79% sensitivity, detecting SARS-CoV-2 in 51% of all children and 43% of those without recent infection.
  • Nasopharyngeal PCR outperformed oropharyngeal swabs in detecting SARS-CoV-2.

Conclusions:

  • Routine PCR testing in infants demonstrates low sensitivity and a high false-negative rate.
  • Current preoperative screening protocols for asymptomatic children, particularly those with recent SARS-CoV-2 recovery, may need re-evaluation due to potential inaccuracies.