A woman in Nevada has been killed by a superbug that proved resistant to every antibiotic available in the US, the Centers for Disease Control and Prevention (CDC) has said.

The woman’s condition was deemed incurable, and 26 different antibiotics were tested in vain before she died in September.

She was in her 70s, and had recently returned to the US after an extended visit to India, according to the CDC’s Morbidity and Mortality Weekly Report. She had been hospitalised there multiple times before returning to the US and being admitted to an acute care hospital in Nevada in mid-August.

One week later local health authorities were notified that every possible medication had been tried without success. The CDC later determined that no drug currently on the market would have stopped the bacteria’s spread.