Abstract：
BACKGROUND: Loose-fitting powered air-purifying respirators (PAPRs) are a popular alternative to the use of filtering facepiece respirators for health care workers. Although PAPRs protect the wearer from aerosol particles, their ability to block infectious aerosol particles exhaled by the wearer from being released into the environment (called source control) is unclear.
METHODS: The source control performance of 4 PAPRs with loose-fitting facepieces were tested using a manikin that exhales aerosol particles. The PAPRs were tested by themselves and in combination with a face-worn product intended to provide source control (either a surgical mask or an N95 filtering facepiece respirator).
RESULTS: Two PAPR facepieces with filtration panels significantly reduced the release of exhaled aerosols into the environment, while 3 facepieces without such panels did not. Wearing a surgical mask or respirator under the facepiece significantly improved the source control performance.
CONCLUSIONS: Most PAPR facepieces do not block aerosols exhaled by the wearer. Facepieces designed to filter exhaled particles can prevent aerosols from being released into the environment. Wearing a surgical mask or a filtering facepiece respirator under the facepiece can also provide source control, but PAPRs are not typically certified for use with masks and respirators.
METHODS: The source control performance of 4 PAPRs with loose-fitting facepieces were tested using a manikin that exhales aerosol particles. The PAPRs were tested by themselves and in combination with a face-worn product intended to provide source control (either a surgical mask or an N95 filtering facepiece respirator).
RESULTS: Two PAPR facepieces with filtration panels significantly reduced the release of exhaled aerosols into the environment, while 3 facepieces without such panels did not. Wearing a surgical mask or respirator under the facepiece significantly improved the source control performance.
CONCLUSIONS: Most PAPR facepieces do not block aerosols exhaled by the wearer. Facepieces designed to filter exhaled particles can prevent aerosols from being released into the environment. Wearing a surgical mask or a filtering facepiece respirator under the facepiece can also provide source control, but PAPRs are not typically certified for use with masks and respirators.
摘要：
背景：宽松的动力空气净化呼吸器（PAPR）是医护人员使用过滤面罩呼吸器的流行替代品。尽管PAPRs保护穿戴者免受气溶胶颗粒的影响，它们阻止佩戴者呼出的感染性气溶胶颗粒释放到环境中的能力(称为源控制)尚不清楚。
方法：使用呼出气溶胶颗粒的人体模型测试了四种具有松散贴合的面罩的PAPR的源控制性能。PAPR本身进行了测试，并与旨在提供源控制的面部佩戴产品（外科面罩或N95®过滤面罩呼吸器）结合使用。）结果：两个带有过滤面板的PAPR面罩显着减少了呼出的气溶胶释放到环境中，而三个没有这种面板的面罩没有。在面罩下佩戴外科面罩或呼吸器显着改善了源控制性能。
结论：大多数PAPR面罩不会阻挡佩戴者呼出的气溶胶。设计用于过滤呼出颗粒的面罩可以防止气溶胶释放到环境中。在面罩下佩戴外科面罩或过滤面罩呼吸器也可以提供源控制，但PAPRs通常没有与口罩和呼吸器一起使用的认证。
方法：使用呼出气溶胶颗粒的人体模型测试了四种具有松散贴合的面罩的PAPR的源控制性能。PAPR本身进行了测试，并与旨在提供源控制的面部佩戴产品（外科面罩或N95®过滤面罩呼吸器）结合使用。）结果：两个带有过滤面板的PAPR面罩显着减少了呼出的气溶胶释放到环境中，而三个没有这种面板的面罩没有。在面罩下佩戴外科面罩或呼吸器显着改善了源控制性能。
结论：大多数PAPR面罩不会阻挡佩戴者呼出的气溶胶。设计用于过滤呼出颗粒的面罩可以防止气溶胶释放到环境中。在面罩下佩戴外科面罩或过滤面罩呼吸器也可以提供源控制，但PAPRs通常没有与口罩和呼吸器一起使用的认证。
