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For all events the likely index patients were pre-symptomatic or mildly symptomatic, which is when infective patients are most likely to interact with large groups of people. Applying the model to those events yields results that suggest the following: (1) transmission was airborne; (2) superspreading events do not require an index patient with an unusually high viral load; (3) the viral loads for all of the index patients were of the same order of magnitude and consistent with experimentally measured values for patients at the onset of symptoms, even though viral loads across the population vary by a factor of &gt;10<jats:sup>8<\/jats:sup>. In particular we used a Wells-Riley exposure model to calculate <jats:italic>q<\/jats:italic>, the total average number of infectious quanta inhaled by a person at the event. Given the <jats:italic>q<\/jats:italic> value for each event, the simple airborne transmission model was used to determined <jats:italic>S<\/jats:italic><jats:sub><jats:italic>q<\/jats:italic><\/jats:sub>, the rate at which the index patient exhaled infectious quanta and <jats:italic>N<\/jats:italic><jats:sub>0<\/jats:sub>, the characteristic number of COVID-19 virions needed to induce infection. Despite the uncertainties in the values of some parameters of the superspreading events, all five events yielded (<jats:italic>N<\/jats:italic><jats:sub>0<\/jats:sub>\u223c300\u20132,000 virions), which is similar to published values for influenza. Finally, this work describes the conditions under which similar methods can provide actionable information on the transmission of other viruses.<\/jats:p>","DOI":"10.1371\/journal.pone.0265816","type":"journal-article","created":{"date-parts":[[2022,6,9]],"date-time":"2022-06-09T17:40:44Z","timestamp":1654796444000},"page":"e0265816","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":49,"title":["Finding the infectious dose for COVID-19 by applying an airborne-transmission model to superspreader events"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7199-8945","authenticated-orcid":true,"given":"Mara","family":"Prentiss","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arthur","family":"Chu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karl K.","family":"Berggren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2022,6,9]]},"reference":[{"issue":"7817","key":"pone.0265816.ref001","doi-asserted-by":"crossref","first-page":"510","DOI":"10.1038\/d41586-020-02058-1","article-title":"Mounting evidence suggests coronavirus is airborne\u2014but health advice has not caught up","volume":"583","author":"D Lewis","year":"2020","journal-title":"Nature"},{"issue":"1","key":"pone.0265816.ref002","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1186\/s12879-019-3707-y","article-title":"Recognition of aerosol transmission of infectious agents: a commentary","volume":"19","author":"R Tellier","year":"2019","journal-title":"BMC Infect Dis"},{"key":"pone.0265816.ref003","unstructured":"Centers for Disease Control and Prevention. 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