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Viral shedding, clinical history and transmission of influenza

B J Cowling1, K H Chan, J S M Peiris

  • 1School of Public Health, The University of Hong Kong, 100 Cyberport Road, Hong Kong. bcowling@hku.hk

Hong Kong Medical Journal = Xianggang Yi Xue Za Zhi
|June 19, 2013
PubMed

Insights

Influenza viral shedding peaks early in illness, with children potentially being more infectious than adults due to higher shedding levels. Viral shedding directly correlates with symptom severity and fever.

Area of Science:

  • Virology
  • Infectious Diseases
  • Pediatrics

Background:

  • Influenza virus is a significant public health concern.
  • Understanding viral shedding dynamics is crucial for infection control.
  • Previous studies have indicated variations in influenza transmission.

Purpose of the Study:

  • To quantify viral shedding patterns in influenza infections.
  • To compare infectiousness between children and adults.
  • To determine the relationship between viral shedding, symptoms, and temperature.

Main Methods:

  • Viral shedding was measured during influenza infections.
  • Infectiousness was assessed by quantifying viral load.
  • Correlation analysis was performed between viral shedding, clinical symptoms, and tympanic temperature.

Main Results:

  • The majority of influenza viral shedding occurs within the initial days post-symptom onset.
  • Children exhibited higher levels of viral shedding compared to adults, suggesting greater infectiousness.
  • A positive correlation was observed between the degree of viral shedding, symptom severity, and elevated tympanic temperature.

Conclusions:

  • Influenza viral shedding is most pronounced in the early stages of illness.
  • Children may represent a more significant source of influenza transmission due to increased viral shedding.
  • Clinical indicators such as symptoms and fever are associated with the level of viral shedding and infectiousness.

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