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. 2021 Aug 5;11:15960. doi: 10.1038/s41598-021-95479-5

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© The Author(s) 2021

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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Direct contact as the main form of transmission of SARS-CoV-2. A, man with COVID-19. B, an infected man comes into direct contact with a healthy person and talks, neglecting the use of a mask and social distance. C, after contact with the infected person, the second man becomes infected with viruses. D, an infected man comes into contact with different inanimate objects. E, a healthy man comes into contact with inanimate objects that have been manipulated by an infected person and is not infected.