India, Feb. 20 -- Ever wondered what happens when you flush a public restroom toilet? Turns out, it's not just water swirling down the drain, it's also sending a cloud of invisible bacteria into the air. A recent study reveals that each flush releases germ-laden droplets that could pose health risks, and some toilet designs make it even worse. (Also read: Stop infections before they start: Must-know safety tips for women using public restrooms )

Researchers from China University of Geosciences investigated how different toilets and ventilation systems impact the spread of airborne bacteria. They focused on two common culprits, Staphylococcus aureus, often found on the skin and in airways, and E. coli, a bacteria that normally lives in th...