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Title: The effect of head orientation and personalized ventilation on bioaerosol deposition from a cough
Authors: Xu, J 
Wang, C 
Fu, SC
Chao, CYH 
Issue Date: Jan-2022
Source: Indoor air, Jan. 2022, v. 32, no. 1, e12973
Abstract: Head orientations directly determine movement directions of exhaled pathogen-laden droplets, while there is a lack of research about the effect of the infected person's head orientations on respiratory disease transmission during close contact. This work experimentally investigated the effect of different head orientations of an infected person (IP) on the bioaerosol deposition on a healthy person (HP) during close contact. Also, the effectiveness of PV flow in reducing bioaerosol deposition on the HP under the IP’s different head orientations was investigated. Bacteriophage T3 was employed to represent viruses inside the cough-generated aerosols. The bioaerosol depositions on different locations of the HP’s upper body (chest, shoulder, and neck) and face (chin, mucous membranes, cheek, and forehead) were characterized by a cultivation method. Results showed that the IP’s different head orientations resulted in significantly different deposition density on the HP. PV flow could reduce the bioaerosol deposition remarkably for most cases investigated. The effectiveness of PV flow in reducing deposition on the HP was significantly affected by the IP’s head orientations. Findings suggest that changing head orientations can be a control measure to reduce the bioaerosol deposition. Personalized ventilation can be a potential method to reduce the bioaerosol deposition on the HP.
Keywords: Bioaerosol deposition
Close contact
Head orientation
Personalized ventilation
Respiratory disease transmission
Publisher: Wiley-Blackwell
Journal: Indoor air 
ISSN: 0905-6947
EISSN: 1600-0668
DOI: 10.1111/ina.12973
Rights: © 2021 John Wiley & Sons A/S
This is the peer reviewed version of the following article: Xu, J, Wang, C, Fu, SC, Chao, CYH. The effect of head orientation and personalized ventilation on bioaerosol deposition from a cough. Indoor Air. 2022; 32:e12973, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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