Masks in COVID-19: let's unmask the evidence.

INTRODUCTION: One of the main issues in the novel coronavirus 2019 (COVID-19) pandemic has been the lack of uniformity of recommendations for the usage of face masks. AREAS COVERED: While Asian countries started using masks early during the epidemic, most Western countries were slow to do so. To avoid such situations, clear guidelines, need to be established, not only regarding the use of masks but also the type of mask to suit different situations. In this article, we will examine the types of masks and review the recommendations for their use based on the available evidence for each type of mask. EXPERT OPINION: We explore future needs in research-related mask use in COVID-19 pandemic, improvements to be made in mask design, adopting guidelines for the use of masks and the psycho-social aspects of widespread and prolonged mask use.