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The role of outdoor fungi on asthma hospital admissions in children and adolescents: a 5-year time stratified case-crossover analysis
Tham, Rachel Katelaris, Constance H. Vicendese, Don Dharmage, Shyamali C. Lowe, Adrian J. Bowatte, Gayan Taylor, Philip Burton, Pamela Abramson, Michael J. Erbas, B.
Tham, Rachel
Katelaris, Constance H.
Vicendese, Don
Dharmage, Shyamali C.
Lowe, Adrian J.
Bowatte, Gayan
Taylor, Philip
Burton, Pamela
Abramson, Michael J.
Erbas, B.
Abstract
Background
Some fungal spores can trigger asthma exacerbation but knowledge of which outdoor fungal spores contribute to asthma hospitalisation is limited.
Objectives
To examine the role of outdoor fungal spores in child and adolescent asthma hospitalisations.
Methods
We conducted a bi-directional time-stratified case-crossover study of child and adolescent asthma hospitalisations over 5 years. Conditional logistic regression assessed the role of 20 fungi taxa (Same day [L0] and lagged [L1-3]) adjusted for maximum temperature, humidity and grass pollen. Strata specific effects were explored if there was evidence of effect modification by age, sex, air pollutants or grass pollen. Non-linear effects examined with Generalized Additive Models.
Results
Of 2098 children hospitalised for asthma, 60% were boys; mean age was 5.5±3.7 years. Fungal spore counts peaked during warm months. Regression models found weak associations with Coprinus [L0,L1: OR=1.03, 1.01–1.06], Periconia [L0: OR=1.03, 1.001–1.07] and Chaetomium [L2: OR=1.08, 1.0–1.2]. Sex appeared to act as an effect modifier with girls having stronger associations with Cladosporium, Coprinus and total fungi. Older adolescent (14–18 years) hospitalisation was significantly associated with Coprinus and Ustilago/smuts. Air pollutants and grass pollen did not appear to act as effect modifiers. Non-linearity was not detected.
Conclusion
There may be associations between some outdoor fungal spores and asthma hospitalisations. Further research needed to explore whether these findings can be replicated; and examine whether fungal sensitisation and/or human rhinovirus infections are associated with stronger effects. If findings are replicated, then the need to develop predictive models for fungal spore distribution and levels may become more important.
Keywords
Child, Adolescent, Asthma, hospitalisations, Outdoor fungi, Case cross-over
Date
2017
Type
Journal article
Journal
Environmental Research
Book
Volume
154
Issue
Page Range
42-49
Article Number
ACU Department
Mary MacKillop Institute for Health Research
Faculty of Health Sciences
Faculty of Health Sciences
Collections
Relation URI
Source URL
Event URL
Open Access Status
License
File Access
Controlled