Researchers have proved the effectiveness of masks with human models, and conducted similar experiments at different distances. It is found that the combination of mask and social distance can significantly reduce the risk of COVID-19 infection when a person comes into contact with an infected person.
Many scientists have conducted simple experiments and studies to prove how masks block tiny particles like SARS-CoV-2, and prove that masks will not pose any safety threat to the wearer. The latest such research concluded that masks play a "key" role in preventing the spread of COVID-19.
Researchers have conducted a series of experiments involving human models to simulate particle transmission with and without masks. As you can see in the following clip, the researchers want to measure the effectiveness of masks in blocking aerosols and droplets. They use mannequins to simulate how infected people spread droplets when wearing any kind of masks (from medical masks to cloth masks). They also studied how mannequins spread the same particle flow without wearing a protective mask.
The researchers also studied the requirements of social distance, and found that the farther the distance between people, the lower the risk of infection, especially in combination with the use of masks.
"We found that the most important measure to reduce the exposure risk of COVID-19 is to wear a mask," said Dr Matthew Callstrom. "We found that disposable paper medical masks and double-layer cloth masks can effectively reduce the spread of droplets, and we did not find any difference in blocking aerosol particles emitted by wearers among mask types."
"The most common transmission mechanism of COVID-19 is through respiratory droplets, which are larger than aerosols and are easier to block with masks." The doctor added.
Both CDC and WHO believe that the virus is mainly transmitted by droplets, and both institutions acknowledge the risks of aerosol transmission. The researchers released the following picture, which compares the size of SARS-CoV-2 virus with that of 2 micron particles, in order to represent the size of aerosol particles that may contain SARS-CoV-2.
The study also measured the different distances of aerosol particles from the source to the target. The researchers found that the number of particles decreased with the increase of distance, and supported the guidance of CDC on keeping social distance, suggesting that the distance between people should be 6 feet. The following figure shows the exposure risks based on masks and social distance. The researchers found that even if the distance between two subjects was more than six feet, the mask would help.
"I think we have a certain understanding of the importance of masks. Some studies have shown that masks can effectively block viruses, but what really matters here is how effective masks are when both sides make masks," said Dr Elle Berbari.
"We objectively found that masks are very important to protect ourselves and people around us," Callstrom said. "If you wear a mask, you are protecting others. If they wear masks, they are protecting you. "
研究人员用人体模型证明了口罩的有效性，并在不同距离进行了类似的实验。研究发现，口罩与社交距离相结合，可以显著降低一个人在接触感染者时感染COVID-19的风险。
此前不少科学家已进行简单的实验和研究，证明口罩是如何阻挡像新冠病毒这样的微小颗粒，并证明口罩不会对佩戴者构成任何安全威胁。最新的此类研究结论是，口罩在预防COVID-19传播方面发挥着 “关键”作用。
研究人员进行了一系列涉及人体模型的实验，以模拟使用和不使用口罩的颗粒传播。正如你在下面的片段中所看到的那样，研究人员想要测量口罩在阻挡气溶胶和飞沫方面的效果。他们使用人体模型来模拟感染者在戴上任何种类的口罩（从医用口罩到布口罩）时如何传播飞沫。他们还研究了人体模型在不戴防护面具的情况下如何传播同样的粒子流。
研究人员还研究了社会距离的要求，发现人与人之间的距离越远，感染的风险就越低，尤其是与口罩的使用相结合。
“我们发现降低COVID-19暴露风险的最重要措施是戴口罩，”Matthew Callstrom博士说。"我们发现，一次性纸质医用口罩和双层布质口罩都能有效地减少飞沫传播，我们没有发现口罩类型之间在阻挡佩戴者发出的气溶胶颗粒方面存在差异。"
“COVID-19最常见的传播机制是通过呼吸道飞沫传播，这种飞沫比气溶胶大，用口罩更容易阻挡。”这位医生补充道。
美国疾控中心和世卫组织都认为病毒主要通过飞沫传播，两个机构都承认气溶胶传播有风险。研究人员发布了以下图片，将SARS-CoV-2病毒的大小与2微米的颗粒进行了对比，意在代表可能含有新冠病毒的气溶胶颗粒的大小。
该研究还测量了气溶胶粒子从源头到目标的不同距离。研究人员发现，粒子数量随着距离的增加而减少，支持美国疾控中心关于保持社交距离的指导意见，建议人与人之间的距离为6英尺。下图显示了基于口罩和社交距离的暴露风险。研究人员发现，即使两个受试者距离超过六英尺，口罩也会有所帮助。
“我想我们对口罩的重要性有一定的了解，已经有一些研究表明口罩能有效阻挡病毒，但这里真正重要的是，当双方都做口罩时，口罩的效果如何，”Elle Berbari博士说。
“我们客观地发现，口罩对于保护自己和周围的人来说是至关重要的，”Callstrom说。“如果你戴着口罩，你是在保护别人。如果他们戴着口罩，他们是在保护你。”
申久集团第五届十二次董事会在上海顺利召开
2021年9月16日下午，申久集团第五届董事会第十二次会议在上海展览中心顺利召开。申久集团董事会成员出席了本次会议，申久集团监事会成员、公司高层领导列席了本次会议，会议由申久集团董事长黄建春主持。
申久集团举行消防事故应急演练活动
为认真贯彻执行“安全第一、预防为主、综合治理”的安全工作方针，规范公司应急管理工作，提高突发事件应急救援反应速度和协调水平，增强综合处置事故的能力，预防和控制次生灾害的发生，保障公司岗位员工和公众的生命安全，最大限度的减少财产损失、环境破坏和社会影响，结合近期周边地区安全生产事故频发的状况，我公司于2021年9月17日进行了成品库丝包着火事故应急演练活动。
“江苏申久•太仓逸枫篮球联谊赛”在申久顺利举行
9月25日下午，秋高气爽，由申久集团工会、团委牵头组织的“江苏申久·太仓逸枫篮球联谊赛”，在申久宿舍区篮球场顺利举行。
血浓情浓，爱融其中 —义务献血报道
申久集团在注重企业发展的同时，肩负社会责任，为社会传递更多的爱心。
喜讯 | 申久集团获颁“慈善爱心企业（单位）”荣誉
申久集团获颁“慈善爱心企业（单位）”，这是对申久集团积极投身公益慈善事业的肯定，申久集团将以此为契机，积极承担更多的社会责任，积极发挥向上向善正能量。
这！就是今日纺织 | 聚焦纺织服装业，《经济日报》报道：筑牢纺织工业强国根基
中国纺织工业联合会会长孙瑞哲表示，“十四五”时期，是在世界百年未有之大变局下，中国推进全面建设社会主义现代化国家的战略机遇期，也是行业在基本实现纺织强国目标的基础上，围绕“科技、时尚、绿色”实现更高质量、更有效率、更加公平、更可持续、更为安全发展的重要窗口期。
纺织非遗助力乡村振兴 巩固脱贫成果（央广网）
手工刺绣蓝牙音箱、扎染单肩包、缠花技艺小饰品……在我国已公布的1300多项国家级非物质文化遗产代表性项目中，纺织类非遗项目多达百余项。近年来，纺织非遗融入现代生活与消费渐成风尚。
申久集团开展安全宣讲及安全风险辨识培训活动
为贯彻“安全第一、预防为主、综合治理”的安全生产工作方针，进一步增强企业员工的安全意识，根据《江苏省工业企业风险报告规定》（省政府令第140号）等相关文件要求以及璜泾镇安全工作部署要求，申久集团组织安全管理人员开展了一次安全宣讲及安全风险辨识培训活动。
省财贸轻纺工会领导莅临申久考察调研
6月11日上午，省财贸轻纺工会二级调研员陈树礼等一行7人，在太仓市总工会副主席徐昭君、璜泾镇副镇长姚巍峰等领导的陪同下，莅临申久公司进行调研工作，申久集团副总裁邱国全、工会主席刘亚东进行了热情接待。
