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--- wissenschaft:miller_sl2020a [2020-07-23 21:30]
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+++ wissenschaft:miller_sl2020a [2020-10-01 21:09] (aktuell)
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 ====== Transmission of SARS-CoV-2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event ======
-Miller SL, Nazaroff WW, Jimenez JL, Boerstra A, Buonanno G, Dancer SJ, Kurnitski J, Marr LC, Morawska L, Noakes C. //Transmission of SARS-CoV-2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event.// Submitted to Indoor Air 2020-06-15. medRxiv preprint doi: [[https://doi.org/10.1101/2020.06.15.20132027|https://doi.org/10.1101/2020.06.15.20132027]]. this version posted 2020-06-18.
+Miller SL, Nazaroff WW, Jimenez JL, Boerstra A, Buonanno G, Dancer SJ, Kurnitski J, Marr LC, Morawska L, Noakes C. //Transmission of SARS-CoV-2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event.// Indoor Air. (2020-09-26). https://doi.org/10.1111/ina.12751
 ===== Zusammenfassung =====
@@ Zeile 7: / Zeile 7: @@
 Eine weitere Fallstudie zum Superspreading-Event beim Skagit Valley Chorale, die mithilfe von Modellierung Evidenz für Übertragung durch Aerosole zu belegen versucht.
-> This modeling analysis has explored the very probable situation in which transmission by inhaling respiratory aerosol that were released during singing caused a large COVID-19 outbreak. Accumulating evidence points to these factors being important for increasing the risk of airborne transmission indoors: high occupancy, long duration, loud vocalization, and poor ventilation.
+===== Abstract =====
-> The results indicate an emission rate of the order of a thousand quanta per hour (mean [interquartile range] for this event = 970 [680-1190] quanta per hour) and demonstrate that the risk of infection is modulated by ventilation conditions, occupant density, and duration of shared presence with an infectious individual.
+> During the 2020 COVID‐19 pandemic, an outbreak occurred following attendance of a symptomatic index case at a weekly rehearsal on 10 March of the Skagit Valley Chorale (SVC). After that rehearsal, 53 members of the SVC among 61 in attendance were confirmed or strongly suspected to have contracted COVID‐19 and two died. Transmission by the aerosol route is likely; it appears unlikely that either fomite or ballistic droplet transmission could explain a substantial fraction of the cases. It is vital to identify features of cases such as this to better understand the factors that promote superspreading events. Based on a conditional assumption that transmission during this outbreak was dominated by inhalation of respiratory aerosol generated by one index case, we use the available evidence to infer the emission rate of aerosol infectious quanta. We explore how the risk of infection would vary with several influential factors: ventilation rate, duration of event, and deposition onto surfaces. The results indicate a best‐estimate emission rate of 970 ± 390 quanta h<sup>‐1</sup>. Infection risk would be reduced by a factor of two by increasing the aerosol loss rate to 5 h<sup>‐1</sup> and shortening the event duration from 2.5 to 1 h.
 {{tag>Skagit_Valley_Chorale Superspreading-Event Aerosol}}
 ---- struct data ----
-sciencepub.pub_datum : 2020-06-18
+sciencepub.pub_datum : 2020-09-26
 sciencepub.pub_authors : Miller SL, Nazaroff WW, Jimenez JL, et al
 ----

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