Nano-sized traps show promise in diagnosing bacterial infections

In collaboration with colleagues from the University of Toronto, Professor Mahshid’s team was able to demonstrate that the system is capable of analysing very small volumes of culture media containing bacterIa such as E. coli and a strain of S. aureus resistant to methicillin, an antibiotic used to treat bacterial infections.

Bacterial infections are blamed for 700,000 deaths a year, and successful treatment of many disease-causing infections depends largely on rapid detection. Unfortunately, it sometimes takes several days to confirm a diagnosis with the tools currently available to doctors.

“Speed is of the essence because some bacterial infections can cause serious health problems and sometimes lead to death,” Mahshid said. “With a fluorescent microscope, the device we’ve developed can confirm the presence of bacteria in just a few minutes. I hope one day clinicians will use our device to deliver faster diagnostics, start treatment much more quickly and, ultimately, save lives.”

Mahshid and her team, who just published their work in the journal Small, now hope to test their device on clinical samples, a necessary step before doctors are able to use such a device in a hospital setting. Theoretically, this new lab-on-a-chip, which is relatively inexpensive and easy to make, could also analyse samples from urine, blood or nasal swabs.