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. 2022 Mar 29;12:4599. doi: 10.1038/s41598-022-08609-y

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Exhaled aerosol particle numbers among healthy and infected human subjects in Germany and India following normal tidal breathing. (A) Exhaled aerosol particle numbers for 357 healthy human subjects in Marburg Germany. (B) Exhaled aerosol particle numbers versus age, with median = 50 years. (C) Exhaled aerosol particle numbers versus BMI, with median = 28. (D) Exhaled aerosol particle numbers versus BMI-age, with median = 1481.22. (E) Exhaled aerosol particle numbers from 87 mildly symptomatic COVID-19 subjects. (F) Mean exhaled aerosol numbers for the 87 COVID-19 patients as a function of time period of infection and recruitment. Error bars represent standard errors of the mean. *P < 0.05, **P < 0.005, ***P < 0.0005.