Research & Development World

  • R&D World Home
  • Topics
    • Aerospace
    • Automotive
    • Biotech
    • Careers
    • Chemistry
    • Environment
    • Energy
    • Life Science
    • Material Science
    • R&D Management
    • Physics
  • Technology
    • 3D Printing
    • A.I./Robotics
    • Software
    • Battery Technology
    • Controlled Environments
      • Cleanrooms
      • Graphene
      • Lasers
      • Regulations/Standards
      • Sensors
    • Imaging
    • Nanotechnology
    • Scientific Computing
      • Big Data
      • HPC/Supercomputing
      • Informatics
      • Security
    • Semiconductors
  • R&D Market Pulse
  • R&D 100
    • Call for Nominations: The 2025 R&D 100 Awards
    • R&D 100 Awards Event
    • R&D 100 Submissions
    • Winner Archive
    • Explore the 2024 R&D 100 award winners and finalists
  • Resources
    • Research Reports
    • Digital Issues
    • R&D Index
    • Subscribe
    • Video
    • Webinars
  • Global Funding Forecast
  • Top Labs
  • Advertise
  • SUBSCRIBE

Method Tests Hard-to-Treat Bacteria’s Susceptibility to Different Antibiotics

By Tracy Hampton, Harvard University | July 25, 2016

The recent emergence of bacterial infections that are resistant to many existing antibiotics is driving an urgent need for tools to quickly identify the small number of therapies that are still effective for individual patients.

Currently, multidrug-resistant bacteria often must be sent to specialized laboratories for analysis, leading to several days of delay before results can guide therapy. Now, investigators at Harvard Medical School and Beth Israel Deaconess Medical Center have developed a simple and versatile method using inkjet printing technology to test such bacteria for susceptibility to antibiotics in a clinical setting.

The method, already available online, is described in the September issue of the Journal of Clinical Microbiology.

When a patient is thought to have an infection, clinicians initially make an educated guess in identifying and prescribing empiric antimicrobial therapy. Meanwhile, they culture a specimen from the patient to identify the bacteria present and to test its susceptibility to different antibiotics.

The results of this susceptibility testing allow physicians to choose drugs that will be effective against the organism, known as directed therapy. However, multidrug-resistant pathogens that no longer respond to commonly used antibiotics must be sent to off-site laboratories where technically complex testing methods help determine the best course of treatment.

“The time between starting empiric therapy and starting directed therapy is what we in my laboratory call the ‘antimicrobial testing gap,’” said James Kirby, associate professor of pathology at HMS and director of the Clinical Microbiology Laboratory at Beth Israel Deaconess.

“If a doctor’s initial guess is good, patients generally do well. Physicians’ initial predictions used to be very good because the susceptibility of our pathogens was predictable; however, with the emergence of multidrug resistance, our instincts are increasingly wrong,” he said. 

Kirby’s lab has been working to reduce the antimicrobial testing gap so that doctors can start patients on directed therapy as soon as possible. The researchers have applied and validated a novel technology that uses inkjet printer technology to perform tests as accurate as those done at specialized laboratories.

Specialized laboratories conduct the current gold-standard diagnostic test, known as the microdilution antibiotic susceptibility test. It requires dozens of steps, a complex set of supplies and a significant amount of time. In their modified approach, called the digital-dispensing method, Kirby and his team used an inkjet printer to print out droplets of antimicrobial compound, with the printed drops varying in size up to a million-fold.

“With this technology, the assay can be set up in a minute or so, and testing multiple drugs for multiple patients requires minimal additional effort,” said first author Kenneth Smith, an HMS research fellow in pathology at Beth Israel Deaconess.

In side-by-side comparisons with the gold-standard microdilution method, the digital-dispensing method was just as accurate. However, the digital-dispensing method demonstrated significantly greater reproducibility (precision) than the current gold standard, meaning that repeated digital-dispensing testing more consistently yields correct results. 

“We believe that our methodology will bring testing for multidrug-resistant pathogens back into clinical laboratories at the site of patient care,” Smith said. “Testing at the site of patient care will significantly decrease the antimicrobial testing gap and allow therapy to be directed in a timely fashion against multi-drug resistant pathogens.”

Kirby also pointed out that hospitals are often slow to adopt the use of new antimicrobial drugs, in part because their laboratories cannot test for susceptibility to these agents. Because only specialized laboratories can test for such susceptibility, infections play out before physicians can use the drugs confidently. “We believe that our application of digital dispensing technology will now make these new antibiotics available for patients and encourage the development and appropriate use of new antimicrobials,” he said.

This work was supported in part by the National Institute of Allergy and Infectious Diseases grants R21AI119114 and R21AI112694.

Related Articles Read More >

Open-source Boltz-2 can speed binding-affinity predictions 1,000-fold
Thermo Fisher’s new Orbitrap Excedion Pro targets complex biotherapeutics for drug development
FDA’s new ‘Elsa’ AI set to expedite clinical protocol reviews
Waters touts six-fold robustness with new Xevo TQ Absolute XR
rd newsletter
EXPAND YOUR KNOWLEDGE AND STAY CONNECTED
Get the latest info on technologies, trends, and strategies in Research & Development.
RD 25 Power Index

R&D World Digital Issues

Fall 2024 issue

Browse the most current issue of R&D World and back issues in an easy to use high quality format. Clip, share and download with the leading R&D magazine today.

Research & Development World
  • Subscribe to R&D World Magazine
  • Enews Sign Up
  • Contact Us
  • About Us
  • Drug Discovery & Development
  • Pharmaceutical Processing
  • Global Funding Forecast

Copyright © 2025 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search R&D World

  • R&D World Home
  • Topics
    • Aerospace
    • Automotive
    • Biotech
    • Careers
    • Chemistry
    • Environment
    • Energy
    • Life Science
    • Material Science
    • R&D Management
    • Physics
  • Technology
    • 3D Printing
    • A.I./Robotics
    • Software
    • Battery Technology
    • Controlled Environments
      • Cleanrooms
      • Graphene
      • Lasers
      • Regulations/Standards
      • Sensors
    • Imaging
    • Nanotechnology
    • Scientific Computing
      • Big Data
      • HPC/Supercomputing
      • Informatics
      • Security
    • Semiconductors
  • R&D Market Pulse
  • R&D 100
    • Call for Nominations: The 2025 R&D 100 Awards
    • R&D 100 Awards Event
    • R&D 100 Submissions
    • Winner Archive
    • Explore the 2024 R&D 100 award winners and finalists
  • Resources
    • Research Reports
    • Digital Issues
    • R&D Index
    • Subscribe
    • Video
    • Webinars
  • Global Funding Forecast
  • Top Labs
  • Advertise
  • SUBSCRIBE