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• W4387255732 abstract "AbstractRespiratory aerosols arise due to bronchial fluid film bursting within the pulmonary tract, the vibration of the vocal folds during phonation, and articulation of the tongue/lips/teeth. We expect respiratory aerosol emission rates to be lower in children than adults due to the smaller size of their laryngeal structure, reduced sub-glottal pressure created during speech, and reduced number of alveoli. However, few studies have evaluated respiratory aerosols for children. We recruited 50 participants from three age categories: children aged 6−11 years, children aged 12−18 years, and adults ( >18 years). We investigated particle emissions for three different 5 s sustained vocalizations of /a/ or /pa/ at 262 Hz, as well as for running speech and breathing. The particle generation rate ranged from 0 to 488 particles/s. Children aged 6−11 years produced fewer particles (mean 12 ± SD 9 particles/s) than children aged 12−18 years (23 ± 19 particles/s) and adults (70 ± 73 particles/s). Taking a deep breath before vocalizing /a/ resulted in higher aerosol emission rates than the baseline case. The particle number size distributions for all vocalizations and age groups consistently showed two modes at ≈0.6 μm and ≈2 μm. Children had a slightly smaller primary mode location and larger secondary mode location than adults. Superemitters (statistical outliers) were found in all groups. Experiments repeated over time revealed large intrapersonal variability indicating additional variables (e.g., environmental, physiological, behavioral) may significantly influence emission rates. The lower respiratory aerosol emission rates for children indicate a need to consider population demographics when predicting airborne disease transmission risks.KEYWORDS: airborne particlesrespiratory emissionCOVID-19aerosolsbioaerosolstransmissionsuperemitterDisclaimerAs a service to authors and researchers we are providing this version of an accepted manuscript (AM). Copyediting, typesetting, and review of the resulting proofs will be undertaken on this manuscript before final publication of the Version of Record (VoR). During production and pre-press, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal relate to these versions also. Additional informationFundingThis work was supported by the National Science Foundation [CBET:2029548] and the Clarkson University COVID-19 Special Solicitation." @default.
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• W4387255732 date "2023-10-02" @default.
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• W4387255732 title "Comparing respiratory aerosol emissions between children and adults during sustained phonation" @default.
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• W4387255732 doi "https://doi.org/10.1080/02786826.2023.2261715" @default.
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