Duration of wheezy episodes in early childhood is independent of the microbial trigger
Christian J Carlsson1, Nadja H Vissing1, Astrid Sevelsted1
1COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark.
Insights
The duration of wheezy episodes in young children is not influenced by specific viral or bacterial triggers. This suggests other factors, like environmental exposures or host factors, impact symptom severity in pediatric respiratory infections.
Area of Science:
- Pediatric respiratory health
- Infectious disease epidemiology
- Microbiology
Background:
- Wheezing in young children is frequently associated with respiratory infections.
- Limited evidence exists on the impact of specific microbial triggers on symptom duration.
- Understanding these triggers is crucial for effective management of pediatric respiratory illnesses.
Purpose of the Study:
- To determine if the duration of wheezy episodes in young children is dependent on the specific microbial pathogen involved.
- Investigating the relationship between identified viruses and bacteria and the length of symptomatic periods.
Main Methods:
- Prospective examination of 283 children from the Copenhagen Prospective Study on Asthma in Childhood birth cohort.
- Analysis of 837 samples for common airway pathogenic bacteria and viruses during acute wheezy episodes in the first three years of life.
- Correlation of microbial findings with symptomatic episode duration monitored via daily diary cards.
Main Results:
- Pathogenic bacteria and viruses were detected in 86% of wheezy episodes.
- Viruses and bacteria co-occurred in 55% of episodes, bacteria alone in 31%, and viruses alone in 10%.
- The median duration of acute symptoms was 9 days, with no significant difference based on bacterial or viral species identified.
Conclusions:
- Symptom duration of wheezy episodes in young children is independent of specific pathogenic bacterial or viral species.
- Factors beyond microbial triggers, such as environmental exposures and host characteristics, likely influence symptom burden.
- The term "viral wheeze" may be misleading, as pathogenic bacteria are prevalent in most wheezing episodes.
Background:
Wheezy episodes in young children are often triggered by viral and bacterial respiratory tract infections, but there is little evidence supporting the hypothesis that symptom duration depends on the specific microbial trigger.
Objective:
We sought to investigate whether the duration of wheezy episodes in young children depends on the microbial trigger.
Methods:
Two hundred eighty-three children from the Copenhagen Prospective Study on Asthma in Childhood2000 at-risk birth cohort were prospectively examined for common airway pathogenic bacteria and viruses during acute wheezy episodes in the first 3 years of life. Findings were related to symptomatic duration of episodes, as monitored in daily diary cards from birth.
Results:
Eight hundred thirty-seven samples were investigated for viruses, bacteria, or both. Both viruses and bacteria were identified in 55% of episodes, bacteria were identified exclusively in 31% of episodes, and viruses were identified exclusively in 10% of episodes. The median duration of acute symptoms was 9 days (interquartile range, 5-16 days), and duration was independent of bacterial or viral species.
Conclusions:
The duration of wheezy episodes was independent of pathogenic airway bacterial or viral species. This suggests that symptom burden from infections is dependent on other factors, such as environmental exposures or host factors. The common term viral wheeze seems inappropriate in view of the finding of pathogenic bacteria in 86% of wheezy episodes.
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