Antibiotic-resistant bacteria found in clouds.

Canadian and French scientists have taken samples from the clouds at the top of the 1,465-meter Puy de Dome and found antibiotic-resistant bacteria in them at a concentration in which they are also present on the Earth's surface. The clouds contained between 330 and 30,000 bacteria per milliliter of water, with an average of about 8,000. And they found 20,800 copies of resistance genes. Now scientists want to limit the spread of bacterial resistance genes. To do this, they will have to figure out exactly how and where the microorganisms get into the clouds.