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Flushing a Public Toilet? Be Sure to Wear a Mask Flushing public toilets or urinals can spew clouds of particles filled with germs into the air, including the new coronavirus that causes COVID-19, Chinese researchers warn. That's why wearing a mask is a must if you need to use a public restroom. Both urine- and feces-based virus transmission is possible. A study by Yangzhou University researchers found public urinals could be especially hazardous. The findings were recently published in the journal Physics of Fluids. "Wearing a mask should be mandatory within public restrooms during the pandemic, and anti-diffusion improvements are urgently needed to prevent the spread of COVID-19," researcher Xiangdong Liu said in a journal news release. Using computer simulations, Liu's team found that more than 57% of aerosol particles released when a urinal is flushed travel. Those contaminated particles can reach a man's thighs within 5.5 seconds. In comparison, it takes 35 s