Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China.
Clinical Microbiology, University Hospitals of Leicester NHS Trust, Leicester, UK.
Indoor Air. 2019 Jul;29(4):577-590. doi: 10.1111/ina.12554. Epub 2019 Apr 15.
Close contact is a part of daily life, and proximity is known to play a primary role in the transmission of many respiratory infections. However, there are no data on close contact parameters such as movement of the head/body and relative location, which can affect both expiration and inspiration flows. Using video cameras, we collected such data for nearly 63 000 seconds of total close contact duration in a graduate student office in Beijing, China. Each student had on average 9.6 close contacts per hour and spent 9.9% of their time participating in close contact interactions. Males made more body/head movements than females during close contact. The probability distribution of interpersonal distance follows a log-normal distribution. The average interpersonal distance was 0.67 m. Students preferred a relative face orientation angle between 15° and 45°. When the relative face orientation angle increased, the interpersonal distance increased. Students had a high probability (73%-97%) of maintaining their head, body, and relative position during close contact, while the probability of body/head or relative position changing from any location/angle to another is also given. These data may be used for assessment of infection risk via close contact in crowded indoor environments.
密切接触是日常生活的一部分，众所周知，近距离接触是许多呼吸道传染病传播的主要因素。然而，目前还没有关于近距离接触参数（如头部/身体的移动和相对位置）的数据，这些参数会影响呼气和吸气流量。我们使用摄像机在中国北京的研究生办公室内收集了近 63000 秒的总近距离接触时长的数据。每位学生平均每小时有 9.6 次近距离接触，有 9.9%的时间参与近距离接触互动。男性在近距离接触时的身体/头部运动比女性多。人际距离的概率分布遵循对数正态分布。平均人际距离为 0.67m。学生更喜欢相对面部方向角在 15°到 45°之间。当相对面部方向角增加时，人际距离也会增加。学生在近距离接触时保持头部、身体和相对位置的概率很高（73%-97%），同时也给出了身体/头部或相对位置从任何位置/角度改变到另一个位置/角度的概率。这些数据可用于评估拥挤室内环境中通过近距离接触传播的感染风险。
