A bacteria resistant to many widely-used antibiotics is unusually common among people in Houston.

The superbug -- known as klebsiella pneuomoniae -- normally lives in the human intestines, where it doesn’t cause any troubles.

However, in other parts of the body and outside the body, it can cause serious infections.

Researchers sequenced the gene of more than 1,700 strains of this bacteria, finding it particularly prevalent in Houston – a city of six million people.