A woman in Pennsylvania appears to be the first patient in the United States to carry antibiotic-resistant bacteria, first seen in Europe and China, according to NBC News.  

The patient went to the doctor with what she thought was just a run of the mill urinary tract infection. When doctors tested her urine, they discovered a unique strain of E.coli. 
In particular, this strain of E.coli is resistant to an antibiotic called Colistin, The Washington Post reported. Colistin is what researchers refer to as the "last resort" for "nightmare bacteria."  

The use of Colistin faded during the 1970s because its levels of toxicity left doctors searching for safer alternatives. However, this antibiotic has been coming back as more antibiotic-resistant strains of bacteria pop up, according to the National Institute of Allergy and Infectious Diseases. 

The drug, which is a last resort for most doctors, can be damaging to a patient's kidneys. 

While the strain found in the woman's urine may be treated with other antibiotics, "researchers worry that its Colistin-resistance gene could spread to other bacteria that can already evade other antibiotics," essentially creating an un-treatable infection, according to The Washington Post. 

The patient with the drug-resistant bacteria had not traveled outside of the United States, so doctors fear that this gene was already here, out of sight. "It is the end of the road for antibiotics unless we act urgently," Dr. Tom Frieden, the director for the Centers for Disease Control told NBC News. 

"Scientists and public health officials have long warned that if the resistant bacteria continue to spread, treatment options could be seriously limited. Routine operations could become deadly. Minor infections could become life-threatening crises. Pneumonia could be more and more difficult to treat," according to the Washington Post. 

Admittedly, researchers have only been looking for this resistant gene for a few weeks, and are unsure how widespread it is. 

"We know now that the more we look, the more we are going to find," Frieden told reporters.