personal protective device face mask respirator face covering https://orcid.org/0000-0002-8844-9165 https://github.com/obi-ontology/obi/issues/1193 Adapted from https://dictionary.cambridge.org/dictionary/english/face-mask A systematic review on the efficacy of face coverings against respiratory viruses analyzed 19 randomized trials and concluded that use of face masks and respirators appeared to be protective in both health care and community settings face mask A personal protective device worn over the nose and mouth as a respiratory filter to inhibit the flow of particles. ready for release