Face masks have been part of our lives for a year now and a leading epidemiologist has predicted that we may need to wear face coverings for several years until we return to normality. Mary Ramsay, the head of immunisation at Public Health England, said basic measures could be in place until other countries successfully roll out vaccines. So after a year of coronavirus, which ones are the best to wear? We took a look at each type of face mask available to find out.
Tag Archives: N95 Mask
Covid-19: ‘The Evolving Science Of Masks’ (Video)
How can you tell if the mask you’re wearing is protective enough against the coronavirus? Correspondent David Pogue volunteers as a test subject to see how N95s work and learns about the science of face coverings.
Health: Put Disposable N95 Masks In Microwave – “Kill Coronavirus” & Reuse
From a physician in Orange County, CA:
“I personally have been microwaving my N95 mask at home everyday so I can reuse it since I travel to several clinics per day and see some high risk patients. The microwave denatures the proteins (and by extrapolation, the virus) and makes it safe to reuse! (the same procedure is used to clean our kitchen sponges)..”
From the CDC:
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Microwaves are used in medicine for disinfection of soft contact lenses, dental instruments, dentures, milk, and urinary catheters for intermittent self-catheterization925-931. However, microwaves must only be used with products that are compatible (e.g., do not melt) 931. Microwaves are radio-frequency waves, which are usually used at a frequency of 2450 MHz. The microwaves produce friction of water molecules in an alternating electrical field. The intermolecular friction derived from the vibrations generates heat and some authors believe that the effect of microwaves depends on the heat produced while others postulate a nonthermal lethal effect932-934. The initial reports showed microwaves to be an effective microbicide. The microwaves produced by a “home-type” microwave oven (2.45 GHz) completely inactivate bacterial cultures, mycobacteria, viruses, and G. stearothermophilus spores within 60 seconds to 5 minutes depending on the challenge organism933, 935-937. Another study confirmed these resuIts but also found that higher power microwaves in the presence of water may be needed for sterilization932. Complete destruction of Mycobacterium bovis was obtained with 4 minutes of microwave exposure (600W, 2450 MHz)937. The effectiveness of microwave ovens for different sterilization and disinfection purposes should be tested and demonstrated as test conditions affect the results (e.g., presence of water, microwave power). Sterilization of metal instruments can be accomplished but requires certain precautions.926. Of concern is that home-type microwave ovens may not have even distribution of microwave energy over the entire dry device (there may be hot and cold spots on solid medical devices); hence there may be areas that are not sterilized or disinfected. The use of microwave ovens to disinfect intermittent-use catheters also has been suggested. Researchers found that test bacteria (e.g., E. coli, Klebsiella pneumoniae, Candida albicans) were eliminated from red rubber catheters within 5 minutes 931. Microwaves used for sterilization of medical devices have not been FDA cleared.
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