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Breakthrough Rapid Tests for Sexually Transmitted Infections Set to Transform Diagnosis

June 5, 2025
in Medicine
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In a groundbreaking advancement poised to revolutionize the diagnosis of sexually transmitted infections (STIs), Linear Diagnostics, a spin-out from the University of Birmingham, has secured £1 million in funding aimed at bringing to fruition a rapid, near-patient diagnostic platform. This novel device, developed in partnership with the National Institute for Health and Care Research (NIHR) HealthTech Research Centre (HRC) in Diagnostic and Technology Evaluation and the North East Innovation Lab at Newcastle Hospitals, promises to deliver unprecedented speed and accuracy in STI detection, potentially transforming clinical practice and patient outcomes.

Current testing methodologies for STIs often face a frustrating trade-off: rapid tests provide results swiftly but lack sensitivity and specificity, while highly accurate laboratory-based nucleic acid amplification tests (NAATs) necessitate sample dispatch and prolonged waiting times, usually spanning days. Linear Diagnostics aims to shatter this paradigm by engineering a platform capable of producing laboratory-grade diagnostic accuracy in as little as five minutes, directly at the point of care. This advancement holds the promise of initiating patient treatment within a single clinical encounter, a critical measure in curbing the chain of transmission for infections such as Neisseria gonorrhoeae and Chlamydia trachomatis.

At the heart of this cutting-edge technology lies Linear’s proprietary Exponential Amplification (EXPAR) technique. EXPAR operates by detecting bacterial DNA fragments through an ultra-rapid signal amplification process. Unlike traditional amplification methods such as polymerase chain reaction (PCR), EXPAR minimizes turnaround time by exponentially amplifying DNA sequences without the thermal cycling intricacies characteristic of PCR. Originally pioneered and validated during the COVID-19 pandemic for viral RNA detection, the utility of EXPAR has now been extended to identify bacterial pathogens responsible for common STIs, urinary tract infections, and respiratory viruses including SARS-CoV-2.

The biology driving EXPAR entails the strategic design of synthetic DNA or RNA probes that trigger enzymatic reactions producing exponentially increasing signals in the presence of targeted pathogen nucleic acids. This method enables the assay to detect trace amounts of bacterial genetic material with remarkable speed and heightened sensitivity, ensuring early and accurate diagnosis. The implications of such rapid detection are profound: it allows for immediate clinical decision-making, reducing likelihood of onward transmission, and mitigating the risk of antibiotic resistance emerging from treatment delays.

Recent years have underscored the urgency for such innovations as multi-drug resistant strains of Neisseria gonorrhoeae have escalated globally, rendering many conventional antibiotics ineffective. Linear Diagnostics’ focus on these pathogens is strategically aligned with pressing public health priorities. The ability to swiftly diagnose and treat patients with resistant infections within a shortened time frame could significantly restrict the spread of these formidable strains.

The three-year funding package awarded by the NIHR’s Invention for Innovation (i4i) program will underpin the final stages of technological refinement including the development of a robust cartridge and reader system, envisioned as a compact, user-friendly point-of-care device. The platform’s design is geared toward minimal operator training requirements, enabling deployment within diverse clinical environments—from specialized sexual health clinics to primary care settings or even community outreach programs—broadening accessibility to life-saving diagnostics.

Comprehensive validation of the device forms a core aspect of this program, ensuring that the diagnostic platform meets stringent clinical standards prior to rollout. Evaluations will include trials involving real-world clinical samples to ascertain diagnostic accuracy under variable conditions, as well as health economic analyses to verify cost-effectiveness for the NHS. These multifaceted assessments are critical in ensuring that the technological promise translates into tangible benefits in patient care and public health.

Expert commentary from Dr. Jean-Louis Duprey, Head of Research and Development at Linear Diagnostics, highlights the inherent challenge their team seeks to overcome: combining rapidity with diagnostic accuracy. Dr. Duprey points out that while lateral flow assays produce quick results, their sensitivity and specificity fall short of what is clinically acceptable for infectious disease control. Conversely, nucleic acid amplification tests, although reliable, are constrained by their reliance on centralized laboratory infrastructure. The new near-patient device bridges this gap by leveraging EXPAR’s rapid amplification prowess.

The NIHR HRC, based at Newcastle upon Tyne Hospitals NHS Foundation Trust in collaboration with Newcastle University, is a vital partner in this mission, facilitating the evaluation and refinement of the diagnostic tool. Their involvement encompasses rigorous review of clinical guidelines, engagement with healthcare providers, patients, and the public to ensure the device meets real-world needs, and pinpointing the optimal points in patient pathways for technological intervention.

Dr. Jana Suklan, Senior Methodologist at the HRC, elaborates on the research approach: synthesizing unmet clinical needs with current practices to better understand where rapid STI diagnostics can make the most impact. By statistically analyzing data generated from clinical samples, the team aims to quantify the accuracy and reliability of the test while also modeling its economic implications. Public contributor involvement further grounds the research in patient-centric outcomes, fostering technologies that resonate with those they are designed to serve.

Moreover, the North East Innovation Lab, under the stewardship of John Tyson, complements this effort by providing access to extensive clinical sample repositories and NHS laboratory testing resources. This synergy accelerates the generation of robust performance data, propelling the diagnostic platform closer to regulatory approval and widespread adoption. Mr. Tyson emphasizes the collaborative spirit fueling these innovations, recognizing the critical role such partnerships play in advancing healthcare technology.

The stakes for this breakthrough could not be higher, as rapid, accurate STI diagnosis is instrumental in stemming infection transmission, enhancing patient care, and combating the burgeoning threat of antibiotic resistance. Should Linear Diagnostics succeed, their technology may set a new gold standard, dramatically shortening the time from sample collection to treatment initiation and empowering clinicians and patients alike in the fight against infectious diseases.

This pioneering venture exemplifies the intersection of innovative science, clinical necessity, and public health policy, demonstrating how interdisciplinary collaboration can expedite translational research. As Linear Diagnostics progresses through its funded development phase, the global healthcare community keenly anticipates the arrival of a rapid test that merges precision and speed, ultimately reshaping how STIs and other infectious diseases are managed in the 21st century.


Subject of Research: Development and clinical evaluation of a rapid, near-patient diagnostic platform for bacterial sexually transmitted infections using Exponential Amplification (EXPAR) technology.

Article Title: Linear Diagnostics Secures £1 Million to Develop Ultra-Rapid STI Testing Platform

News Publication Date: Not specified

Web References:

  • Linear Diagnostics: https://www.lineardiagnostics.com/
  • NIHR HealthTech Research Centre (HRC): https://hrc-techeval.nihr.ac.uk/
  • North East Innovation Lab: https://commercial.newcastle-hospitals.nhs.uk/our-services/innovation-lab/
  • EXPAR Research Publication: https://www.pnas.org/doi/full/10.1073/pnas.2100347118

Keywords: Infectious diseases, Medical diagnosis, Diagnostic accuracy, Sexually transmitted infections, Rapid testing, Nucleic acid amplification, Exponential Amplification (EXPAR), Point-of-care diagnostics, Neisseria gonorrhoeae, Chlamydia trachomatis, Antimicrobial resistance.

Tags: Chlamydia trachomatis rapid testingcurbing infection transmission ratesfunding for health tech innovationhealthtech research partnershipslaboratory-grade diagnostics at point of careLinear Diagnostics breakthroughnear-patient testing technologyNeisseria gonorrhoeae testing advancementspatient treatment initiationrapid STI diagnostic testsSTI detection speed and accuracytransforming clinical practice for STIs
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