Dirt-dwelling bacteria may hold the key to understanding antibiotic-resistant germs. This according to biochemist Gerry Wright of McMaster University in Canada. He explains that soil bacteria constantly fight each other with natural antibiotics, many of which have led to lifesaving drugs. But they also have to defend themselves. So he and his colleagues tested nearly 500 strains of soil bacteria for resistance to 21 different antibiotics.

GERRY WRIGHT (McMaster University, Canada): says
And we found that on average, these organisms are resistant to between 6 and 8 different antibiotics, sometimes as many as 15 of the 21 that we studied.