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During the COVID-19 pandemic, face masks or coverings, including N95, FFP2, surgical, and cloth masks, have been employed as public and personal health control measures against the spread of SARS-CoV-2, the virus that causes COVID-19 . In community and healthcare settings, the use of face masks is intended as source control to limit ...
A sign offering free COVID-19 face masks at a retailer in the United States. The wearing of non-medical face masks in public to lessen the transmission of COVID-19 in the United States was first recommended by the CDC on April 3, 2020, as supplemental to hygiene and appropriate social distancing. Throughout the pandemic, various states ...
File:COVID-19 Vaccination Record Card CDC (8-17-2020).pdf. Size of this JPG preview of this PDF file: 710 × 599 pixels. Other resolutions: 284 × 240 pixels | 569 × 480 pixels | 725 × 612 pixels. Original file (725 × 612 pixels, file size: 52 KB, MIME type: application/pdf, 2 pages) This is a file from the Wikimedia Commons.
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Surgical mask. A surgical mask, also known by other names such as a medical face mask or procedure mask, is a personal protective equipment used by healthcare professionals that serves as a mechanical barrier that interferes with direct airflow in and out of respiratory orifices (i.e. nose and mouth ). This helps reduce airborne transmission of ...
FFP standards. FFP standards refer to the filtering half mask classification by EN 149, a European standard of testing and marking requirements for filtering half masks. [1] FFP standard masks (where FFP stands for filtering facepiece) [2] cover the nose, mouth and chin and may have inhalation and/or exhalation valves. [1]
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [1] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
A mask is an object normally worn on the face, typically for protection, disguise, performance, or entertainment, and often employed for rituals and rites. Masks have been used since antiquity for both ceremonial and practical purposes, as well as in the performing arts and for entertainment.
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