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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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The lower respiratory tract is anatomically composed of several vital structures, including the larynx, trachea, bronchial tree, alveoli, lungs, and pleurae. Each component has a specific function, and all are intricately connected to ensure efficient respiration.
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The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.
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The upper respiratory tract plays a vital role in the respiratory system, comprising several structures that facilitate air intake and prepare air for the lungs. It also serves as the first line of defense against pathogens and particles. This tract includes the nose and nasal cavity, the oral cavity, the paranasal sinuses, and the pharynx, each with specific functions and features.
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Establishing a Liquid-covered Culture of Polarized Human Airway Epithelial Calu-3 Cells to Study Host Cell Response to Respiratory Pathogens In vitro
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How to use…respiratory viral studies.

Simon B Drysdale1,2, Dominic F Kelly1,2

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Archives of Disease in Childhood. Education and Practice Edition
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PubMed
Summary

Pediatric viral respiratory tract infections are common, ranging from mild to severe. Real-time PCR testing of respiratory samples accurately identifies these viruses, guiding clinical management.

Keywords:
infectious diseasesrespiratoryvirology

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Area of Science:

  • Pediatrics
  • Infectious Diseases
  • Virology

Background:

  • Viral respiratory tract infections are the most frequent childhood infections.
  • These infections present a spectrum of illness, from mild upper respiratory symptoms to critical lower respiratory disease.
  • Accurate diagnosis is crucial for appropriate patient care and management.

Purpose of the Study:

  • To review the appropriate indications for testing children with suspected viral respiratory tract infections.
  • To outline the recommended methods for sample collection and testing.
  • To guide the interpretation of viral test results within the clinical context.

Main Methods:

  • Review of current literature and clinical guidelines.
  • Discussion of diagnostic techniques, focusing on real-time PCR.
  • Emphasis on the correlation between clinical presentation and laboratory findings.

Main Results:

  • Real-time PCR offers high sensitivity and specificity for identifying respiratory viruses.
  • Testing strategies should be guided by clinical suspicion and disease severity.
  • Interpreting results requires consideration of the patient's overall clinical picture.

Conclusions:

  • Timely and accurate diagnosis of viral respiratory infections in children is essential.
  • Real-time PCR is a valuable tool for identifying common respiratory viruses.
  • Clinical correlation is paramount for effective management of pediatric respiratory illnesses.