Mask decontamination methods (model N95) for respiratory protection: a rapid review

Probst, Livia Fernandes; Guerrero, Ana Tereza Gomes; Cardoso, Andréia Insabralde de Queiroz; Grande, Antonio Jose; Croda, Mariana Garcia; Venturini, James; Fonseca, Maria Cristina de Camargo; Paniago, Anamaria Mello Miranda; Barreto, Jorge Otávio Maia; de Oliveira, Sandra Maria do Vale Leone

BACKGROUND: N95 respiratory protection masks are used by healthcare professionals to prevent contamination from infectious microorganisms transmitted by droplets or aerosols. METHODS: We conducted a rapid review of the literature analyzing the effectiveness of decontamination methods for mask reuse. The database searches were carried out up to September 2020. The systematic review was conducted in a way which simplified the stages of a complete systematic review, due to the worldwide necessity for reliable fast evidences on this matter. RESULTS: A total of 563 articles were retrieved of which 48 laboratory-based studies were selected. Fifteen decontamination methods were included in the studies. A total of 19 laboratory studies used hydrogen peroxide, 21 studies used ultraviolet germicidal irradiation, 4 studies used ethylene oxide, 11 studies used dry heat, 9 studies used moist heat, 5 studies used ethanol, two studies used isopropanol solution, 11 studies used microwave oven, 10 studies used sodium hypochlorite, 7 studies used autoclave, 3 studies used an electric rice cooker, 1 study used cleaning wipes, 1 study used bar soap, 1 study used water, 1 study used multi-purpose high-level disinfection cabinet, and another 1 study used chlorine dioxide. Five methods that are promising are as follows: hydrogen peroxide vapor, ultraviolet irradiation, dry heat, wet heat/pasteurization, and microwave ovens. CONCLUSIONS: We have presented the best available evidence on mask decontamination; nevertheless, its applicability is limited due to few studies on the topic and the lack of studies on real environments. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13643-021-01742-1.