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Related Experiment Videos

Post-infectious olfactory dysfunction exhibits a seasonal pattern.

I Konstantinidis1, A Haehner, J Frasnelli

  • 1Smell & Taste Clinic, Department of Otorhinolaryngology, University of Dresden Medical School Technische Universität Dresden, Dresden, Germany.

Rhinology
|June 24, 2006
PubMed
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Olfactory dysfunction after upper respiratory tract infections (URTIs) shows distinct spring seasonality, peaking in March and May. This pattern differs from typical winter URTI seasonality, suggesting unique viral triggers like influenza and parainfluenza.

Area of Science:

  • Otolaryngology
  • Infectious Disease Epidemiology
  • Neuroscience

Background:

  • Upper respiratory tract infections (URTIs) are common, often leading to temporary or persistent olfactory dysfunction.
  • The seasonality of post-URTI olfactory loss is not well understood and may differ from the seasonal patterns of URTIs themselves.

Purpose of the Study:

  • To investigate the incidence and seasonality of olfactory dysfunction following upper respiratory tract infections (post-URTI).
  • To compare the seasonal pattern of post-URTI olfactory loss with the known seasonality of URTIs.

Main Methods:

  • A retrospective study analyzed data from 457 patients with post-URTI olfactory loss over a 6-year period.
  • Patient records were assessed for demographics and time of onset.
  • Olfactory dysfunction severity was evaluated using the "Sniffin' Sticks" test, measuring odour threshold, discrimination, and identification.

Related Experiment Videos

Main Results:

  • The incidence of post-URTI olfactory dysfunction displayed seasonal fluctuations, deviating from the typical winter URTI seasonality.
  • Peak incidences were observed in March (12.7%) and May (12.6%), with the lowest incidence in September (5.6%).
  • Significant differences in incidence were noted between peak months and months with high URTI prevalence.

Conclusions:

  • Post-URTI olfactory dysfunction exhibits a distinct spring seasonality, with peaks in March and May.
  • Influenza virus is a potential cause for the March peak, while parainfluenza type III may contribute to the May peak.
  • Climate conditions might influence nasal epithelial susceptibility to specific viral infections during spring, contributing to the observed seasonality.