Israeli researchers say they have created a reusable face mask which cleans itself with heat.
The mask has a USB port which connects to a power source and heats its inner layer of carbon fibres by up to 70C - a temperature high enough to destroy coronavirus.
Users are advised not to wear the mask during the disinfection process, which takes roughly 30 minutes, Yair Ein-Eli told Reuters news agency.
Ein-Eli led the research at Israel's Technion University, spurred by widening disparities between global supply and demand for masks.
The researchers have filed a patent for the mask in the US, and plan to sell it commercially.
Greece has seen relatively few cases of coronavirus. According to Johns Hopkins University data, it has recorded 3,148 confirmed infections and 185 deaths, and the government has already allowed businesses to reopen and travel to restart across the country.
As of Monday, authorities have also allowed brothels to reopen - albeit under strict new guidelines.
Visits are limited to 15 minutes per customer, with masks recommended for workers and clients.
Doors and windows should be kept open to allow fresh air in, payment should only be by card and not by cash, and businesses should keep a list of clients - along with their names and phone numbers - in a sealed envelope for four weeks, in case authorities need to trace infections.
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