Bacteria resistant to last-resort antibiotic appears in U.S.

Gene from E. coli strain could spread to other bacteria

E. coli

SUPERBUG A strain of E. coli resistant to the antibiotic colistin has infected a woman in Pennsylvania (3-D rendering of an E. coli bacteria shown).

SARANS/Shutterstock

A last-ditch weapon against drug-resistant bacteria has met its match in Pennsylvania.