Showing posts with label new technology. Show all posts
Showing posts with label new technology. Show all posts

Friday, January 21, 2011

Pfizer reaches out to academia—again

Nature Biotechnology, doi:10.1038/nbt0111-3

Pfizer is rolling out a grand plan to draw out drug-development-ready research from academia through a series of collaborations with leading medical centers worldwide. The first collaboration, announced in November, is with the University of California, San Francisco (UCSF), to which the pharma giant will commit $85 million. Coincidentally, London-based GlaxoSmithKline, is launching a similar outreach program, but with a very different approach. Like Pfizer, it wants to access leading academic researchers with targets ripe for translation into the clinic. Its scope, however, is more modest and targeted, focused on individual scientists.

For Pfizer, the overall aim in setting up these Global Centers for Therapeutic Innovation (CTIs) is to move novel bio-therapeutics rapidly into human clinical trials—each project will aim to deliver a drug through phase 1 testing in five years. Pfizer expects five such initiatives to be up and running in 2011 in the United States, Europe and Asia. Assuming eight projects per CTI, this could bring dozens of differentiated biologics against new targets into the clinical pipeline.

The New York–based pharma will set up shop on each campus, contributing proprietary phage display libraries, peptide libraries and associated technologies for rapidly generating antibodies to be used as probes against the novel targets flagged by university researchers. Each CTI will be staffed with 20–25 Pfizer employees with expertise in cell-line generation, protein characterization and purification—the skill sets needed to rapidly identify and advance molecules into the clinic. All decision making, from the initial acceptance of proposals through the determination to start clinical testing, will be made by a joint steering committee. “The concept is to make a transition away from the vertically integrated R&D model into smaller, decentralized groups of a truly global nature,” says Pfizer's Anthony Coyle, who is heading up the program out of the company's Cambridge, Massachusetts, facilities.

As important, the CTI model creates a 50-50 joint relationship where the goals of the investigators and the company are aligned and both sides are empowered to succeed. “There has got to be a change in the mindset from 'We own this, you do this for us,'” says Coyle. The CTIs will seek out investigators who have already developed a hypothesis around a novel disease mechanism and are keen to translate their discoveries into drugs. “These will be projects where we can articulate very clearly at the beginning what the first-in-man study will be,” says Coyle. The strategy will be to define the mechanism of action and in parallel develop the appropriate drug to hit the target and also determine the right patient population to target with it.

The model “allows us to leverage all of the drug discovery capability in our organization—the ability to make clinical grade material, the finances to perform the right enabling toxicology studies, and the regulatory support to allow the investigator to realize the ambition and see the concept translated,” says Coyle. He also hopes to bypass animal modeling. “What's becoming clear to me is that the time you spend on in vivo validation has zero impact, in most cases, on whether you will be successful going into the clinic. Here we propose to define the mechanism based on a human in vitro system, very quickly, which is again aided by having our phage library right there with the individuals doing the research.”

Funding for CTI initiatives will follow a pre-negotiated template Pfizer will put down at each institution. The company will pay for one to three post docs for each participating laboratory and the steering committee will have access to a flexible fund used either for additional biology or to allow the joint project team to move a compound into trials. There will be two clinical milestone payments, at proof of mechanism and successful proof of concept. All joint inventions will be jointly owned, with Pfizer holding an exclusive option to license a drug after proof of mechanism. In the event Pfizer exercises its option, any jointly developed enabling intellectual property (IP) would be licensed from the institution. If Pfizer declines, IP and other joint assets revert to the institution, which could then partner with someone else.

“There's going to be less of an establishment of value going into this, and more of it saved for the negotiation about the IP, which is downstream,” says S. Claiborne Johnston, director of the UCSF Clinical and Translational Science Institute.

In the past, most collaborations, however, have failed to lead to new drugs. “I think they generally have failed because of the misalignment of the interests of the academic investigators and the industrial partners,” says David Mack of the venture firm Alta Partners, in San Francisco, either because the academics were driven by other basic research questions or because of a lack of appreciation for the cost, risk and time that drug development takes. “They see that they've created an asset that is worth a lot, but actually it's not worth a lot because all of the risk is ahead of us—investment capital, development, technical risk.”

But as grant funding proves ever harder to find, it's an opportune time for exploring new models. Plus, the venture capital industry is contracting significantly and is also shifting its focus, where possible, to more late-stage, downstream investments. The absence of an initial public offering market has made some of the investigators more realistic. “It's the right time for that kind of approach—getting them involved on a risk-sharing basis and setting some realistic near- to midterm milestones to achieve some value creation, even if it means then passing it on to Pfizer in exchange for a royalty,” says Mack. The ability to hit the group running with a program and have immediate access to Pfizer's development resources may also be attractive to academics who are either uncomfortable or impatient with the venture capital process, where initial fund-raising could take years.

But more experienced academic entrepreneurs might not want to trade control or more potential upside in exchange for expediency. Paul Schimmel of the Scripps Research Institute in La Jolla, California, believes that “To preserve their freedom and work in an academic-like way, they'll probably want to turn to do that in the venture community and startups rather than the pharmaceutical industry, where it can get buried and disappear.”

A tendency for people within companies to move is another ongoing issue. Regis Kelly, director of the California Institute for Quantitative Biosciences (QB3), a nonprofit institute spanning three University of California campuses in the San Francisco Bay Area, points to pharma's frequent management changes as a potential snag in making the partnerships thrive. For instance, in 2008, soon after Pfizer merged with Wyeth, it dissolved the Bio-therapeutics and Bio-innovation Center (BBC) on UCSF's Mission Bay campus—set up in 2007 as a hybrid between academia and industry, to work on translational projects (Nat. Biotechnol. 27, 308, 2009). For about a year, Kelly recalls, “there was a hiatus, where we couldn't start any new programs together.”

Even as Pfizer focuses on decentralizing industry-academic partnerships, London-based GlaxoSmithKline (GSK) will soon adopt a virtual approach. GSK aims to create up to ten relationships with individual researchers throughout the world, forming a virtual project team with each of them in order to, like Pfizer, provide immediate access to GSK resources. “We're not talking about giving lots of money across to academia,” says GSK's Patrick Vallance, who is leading the program. An experienced drug discoverer will work in tandem with the research group. “At the beginning it's very focused, with access to the whole of GSK's expertise,” he says.

GSK is set to announce the first of its collaborations under the program, with Mark Pepys at University College, London (UCL), and Pepys' UCL spinout, Pentraxin Therapeutics, for the development of a small molecule to treat amyloidosis. GSK and Pentraxin are already working together to develop an antibody to treat the disease.

To some extent, Pfizer's CTI programs echo the spirit of Eli Lilly's Chorus initiative, started in 2007, in which a venture firm supplies the Indianapolis-based pharma with compounds for Lilly to rapidly advance through phase 1. But whereas both emphasize speed to the clinic from a similar preclinical starting point, the CTIs will also explore the biology around its targets in depth, at greater cost, but also presumably to its benefit. Indeed, although Pfizer is aware of the importance of targeted therapeutics and personalized medicine, “It's not an area we have invested a significant amount of time in,” says Coyle. By focusing on translational medicine up front, “We're going to have a broader impact in the organization,” he says.

Wednesday, September 8, 2010

Researchers Are Developing Painless Alternatives to Needles

US researchers are working on developing new technologies that allow patients to receive injectable medicines without needle sticks - reducing the chance of spreading blood-borne diseases like HIV or hepatitis C and eliminating the need for doctors and nurses to administer the treatments.
A team from Emory University's School of Medicine and Georgia Institute of Technology has developed a Band-Aid-size patch covered with tiny microneedles. The number of needles range from a dozen to more than 100, depending on what type of medicine is being administered and how much. The microneedles, short enough to avoid nerves, are made up of the medicine itself, mixed with a Food and Drug Administration (FDA)-approved polymer and poured into a mold. What looks like miniscule upside-down ice cream cones are attached to the adhesive patch. The patient presses the patch into his or her arm, and the needles dissolve, leaving just a bandage to be discarded. Animal testing thus far has shown no adverse effects.
Mark Prausnitz, a professor of chemical and biomedical engineering at Georgia Tech, said the goal is to conduct human clinical trials within the next few years and obtain FDA approval within about five years.
Researchers at the University of California-Santa Barbara are working on a needleless injection that uses a single stream of liquid medicine about as thin as a hair strand. "A high-velocity jet pierces the skin and deposits the drug either into the skin or underneath it," said Samir Mitragotri, a chemical engineering professor at UCSB. Such jet injector technology has been in use for decades, usually to administer insulin, but the UCSB team is developing ways to "keep the penetration shallow and avoid the pain," Mitragotri said.
In Europe, scientists are testing the Painless Laser Epidermal System developed by Liechtenstein-based Pantec Biosolutions. This technology uses a handheld laser to painlessly create hundreds of tiny micropores over which a medicine-filled patch is applied; it reportedly remains a few years from market.

Plain Dealer (Cleveland, OH)     (08.24.10):: Diane Suchetka

Thursday, May 21, 2009

Digital Disease Detection — Harnessing the Web for Public Health Surveillance

http://content.nejm.org/cgi/content/full/360/21/2153?query=TOC
NEJM -- Digital Disease Detection -- Harnessing the Web for Public Health SurveillanceJohn S. Brownstein, Ph.D., Clark C. Freifeld, B.S., and Lawrence C. Madoff, M.D.
NEJM -- Digital Disease Detection -- Harnessing the Web for Public Health Surveillance
  • The Internet has become a critical medium for clinicians, public health practitioners, and laypeople seeking health information. Data about diseases and outbreaks are disseminated not only through online announcements by government agencies but also through informal channels, ranging from press reports to blogs to chat rooms to analyses of Web searches (see Digital Resources for Disease Detection). Collectively, these sources provide a view of global health that is fundamentally different from that yielded by the disease reporting of the traditional public health infrastructure.1
  • Over the past 15 years, Internet technology has become integral to public health surveillance. Systems using informal electronic information have been credited with reducing the time to recognition of an outbreak, preventing governments from suppressing outbreak information, and facilitating public health responses to outbreaks and emerging diseases. Because Web-based sources frequently contain data not captured through traditional government communication channels, they are useful to public health agencies, including the Global Outbreak Alert and Response Network of the World Health Organization (WHO), which relies on such sources for daily surveillance activities.
  • Early efforts in this area were made by the International Society for Infectious Diseases' Program for Monitoring Emerging Diseases, or ProMED-mail, which was founded in 1994 and has grown into a large, publicly available reporting system, with more than 45,000 subscribers in 188 countries.2
  • ProMED uses the Internet to disseminate information on outbreaks by e-mailing and posting case reports, including many gleaned from readers, along with expert commentary.
  • In 1997, the Public Health Agency of Canada, in collaboration with the WHO, created the Global Public Health Intelligence Network (GPHIN), whose software retrieves relevant articles from news aggregators every 15 minutes, using extensive search queries.
  • ProMED and GPHIN played critical roles in informing public health officials of the outbreak of SARS, or severe acute respiratory syndrome, in Guangdong, China, as early as November 2002, by identifying informal reports on the Web through news media and chat-room discussions.
  • More recently, the advent of openly available news aggregators and visualization tools has spawned a new generation of disease-surveillance "mashups" (Web application hybrids) that can mine, categorize, filter, and visualize online intelligence about epidemics in real time.
  • For instance, HealthMap is an openly available public health intelligence system that uses data from disparate sources to produce a global view of ongoing infectious disease threats. It has between 1000 and 150,000 users per day, including public health officials, clinicians, and international travelers.
  • Other similar systems include MediSys, Argus, EpiSPIDER, BioCaster, and the Wildlife Disease Information Node. Automated analysis of online video materials and radio broadcasts will soon provide additional sources for early detection.

NEJM -- Digital Disease Detection -- Harnessing the Web for Public Health Surveillance

  • The ease of use of blogs, mailing lists, RSS (Really Simple Syndication) feeds, and freely available mapping technology has meant that even an individual expert can create an important global resource. For instance, Declan Butler, a reporter at Nature, took aggregated data from various sources to provide a view of the spread of H5N1 avian influenza on a Google Earth interface. Similarly, Claudinne Roe of the Office of the Director of National Intelligence produces the Avian Influenza Daily Digest and blog, a collection of unclassified information about confirmed and suspected human and animal cases of H5N1 influenza.
  • Although news media represent an important adjunct to the public health infrastructure, the information they report pales in comparison to the potential collective intelligence that can be garnered from the public. An estimated 37 to 52% of Americans seek health-related information on the Internet each year, generally using search engines to find advice on conditions, symptoms, and treatments.
  • Logs of users' chosen keywords and location information encoded in their computers' IP (Internet Protocol) addresses can be analyzed to provide a low-cost data stream yielding important insights into current disease trends.3
  • The power of these data has been demonstrated by studies of search engines provided by Google4 and Yahoo,5 in which data on searches using influenza-related keywords were used to generate an epidemic curve that closely matched that generated by traditional surveillance for influenza-related illness, deaths, and laboratory results.
  • Google Flu Trends now provides a prospective view of current influenza search patterns throughout the United States.
  • An example of the power of search-term surveillance can be found in an examination of the recent peanut-butter–associated outbreak of Salmonella enterica serotype Typhimurium.

  • Using Google Insights for Search, a search-volume reporting tool from Google:-

  1. we compared the epidemic curve of onset dates for confirmed infections with trends in the volume of Internet searches on related terms in the United States.

  2. Search terms included "diarrhea," "peanut butter," "food poisoning," "recall," and "salmonella," and search volumes were compared with the corresponding volumes from the previous year.

NEJM -- Digital Disease Detection -- Harnessing the Web for Public Health Surveillance
  • Though mining the Web is a valuable new direction these sources cannot replace the efforts of public health practitioners and clinicians. The Internet is also providing new opportunities for connecting experts who identify and report outbreaks.
  • Information technologies such as wikis, social networks, and Web-based portals can facilitate communication and collaboration to accelerate the dissemination of reports of infectious diseases and aid in mobilizing a response.
  • Some scientific societies are now leveraging technologies for distributed data exchange, analysis, and visualization.
  1. For instance, the International Society for Disease Surveillance has created the Distributed Surveillance Taskforce for Real-Time Influenza Burden Tracking and Evaluation (DiSTRIBuTE), a group of state and local health departments that use the Web to share, integrate, and analyze health data across large regions.
  2. And the International Society of Travel Medicine, in collaboration with the Centers for Disease Control and Prevention (CDC), has created the GeoSentinel project, which brings together travel and tropical-medicine clinics in an electronic network for surveillance of travel-related illnesses. S
  3. imilarly, the Emerging Infections Network, administered by the Infectious Diseases Society of America in collaboration with the CDC, is a Web-based network of more than 1000 infectious disease specialists that is geared toward finding cases during outbreaks and detecting new or unusual clinical events.
  • Eventually, mobile-phone technology, enabled by global positioning systems and coupled with short-message-service messaging (texting) and "microblogging" (with Twitter), might also come into play. For instance, an organization called Innovative Support to Emergencies, Diseases, and Disasters (InSTEDD) has developed open-source technology to permit seamless cross-border communication between mobile devices for early warning and response in resource-constrained settings.
  • Information overload, false reports, lack of specificity of signals, and sensitivity to external forces such as media interest may limit the realization of their potential for public health practice and clinical decision making. Sources such as analyses of search-term use and news media may also face difficulties with verification and follow-up. Though they hold promise, these new technologies require careful evaluation. Ultimately, the Internet provides a powerful communications channel, but it is health care professionals and the public who will best determine how to use this channel for surveillance, prevention, and control of emerging diseases.
Digital Resources for Disease Detection.

Sample Web-based data sources

ProMED-mail, www.promedmail.org

Global Public Health Intelligence Network (GPHIN), www.phac-aspc.gc.ca/media/nr-rp/2004/2004_gphin-rmispbk-eng.php

HealthMap, www.healthmap.org

MediSys, http://medusa.jrc.it

EpiSPIDER, www.epispider.org

BioCaster, http://biocaster.nii.ac.jp

Wildlife Disease Information Node, http://wildlifedisease.nbii.gov

H5N1 Google Earth mashup, www.nature.com/avianflu/google-earth

Avian Influenza Daily Digest and blog, www.aidailydigest.blogspot.com

Google Flu Trends, www.google.org/flutrends

Google Insights for Search, www.google.com/insights/search

DiSTRIBuTE, www.syndromic.org/projects/DiSTRIBuTE.htm

GeoSentinel, www.istm.org/geosentinel/main.html

Emerging Infections Network, http://ein.idsociety.org

Argus, http://biodefense.georgetown.edu

Sample health-related social-networking sites

Physicians, www.sermo.com

Patients, www.patientslikeme.com

Everyone, www.healthysocial.org

Wednesday, May 20, 2009

Detecting Aircraft Pathogens Before It's Too Late

http://www.technologyreview.com/computing/22667/?nlid=2037
A new study suggests that single particle detectors should be used to help control pandemics.
  • Each year, an estimated 600 million passengers fly in the United States, and of those, roughly 350,000 are international travelers, according to the Bureau of Transportation Statistics. This leaves commercial airliners vulnerable to biological contamination and makes the spread of disease a real threat.
  • Now researchers at the MITRE Corporation have conducted a study that, for the first time, looks at the particle distribution of exhaled breath to better understand how airborne pathogens spread in aircraft cabins, and how best to detect the particles that could contain viruses.
  • "The most important point is that if you want to detect infectious viruses from exhaled breath, you need a biosensor with single particle detection," says Grace Hwang, principal investigator of the study and a lead biosensors scientist at MITRE. "Most commercially available biosensors need 10 million viruses before they can inform the user that a virus of concern has been caught, and usually diagnosis takes three to four hours." This is problematic, adds Hwang, since most viruses are found in low concentrations when expelled from an infected person, and many flights do not last more than 90 minutes.
  • In addition, the researchers determined that most particles stayed suspended in the aisle, so when booking a trip, take a window seat, says Michael Harkin, a member of the MITRE team, who presented the research at the 2009 IEEE Conference on Technologies for Homeland Security. Particles also did not travel far outside the contaminated row, and if they did, it was across the row. Previously, it was thought that contaminants would travel front to back, or back to front. "There was minimal exposure to the row in front of, and to the window passengers in, [the contaminated row]," says Harkin. Thus, the researchers concluded that biosensors should be placed at the ceiling of the aircraft cabin, about every four rows.
  • "Our goal is to capture the infected cases coming into the U.S. before people are symptomatic," says Hwang. "That will buy time to defend against a pandemic spread, and the economic benefits would be enormous."
  • The need for such sensors was evident in the 2003 outbreak of Severe Acute Respiratory Syndrome (SARS), which originated in an Air China flight from Hong Kong to Beijing, spread through 18 countries, and resulted in 774 fatalities. Asian economies suffered $11 billion in damages. "If you have an appropriate device to detect pathogens on aircraft, which is a huge challenge, then you are prepared for a deadly outbreak," says Byron Jones, associate dean for research and graduate programs at Kansas State University, and director of its engineering experiment station.
  • "We have seen how the swine flu spreads, and while it has turned out to be a mild disease, if it were something deadly and contagious like typhoid fever, it could be a different story." Jones is also part of a team of experts at the Air Transportation Center for Excellence currently looking into the healthfulness of aircrafts.
  • To conduct the study, MITRE researchers used a computational fluid dynamics model to investigate the extreme coughing and sneezing situations of seven passengers known as "super spreaders." (Super spreaders cough and sneeze at a rate of 50 times per hour.) The software modeled the aircraft ventilation of a Boeing 767 airliner cabin, as many prior studies have done to determine the optimal sensor placement. But that does not tell you anything about the number of particles exhaled, says Hwang.
  • The researchers found the fluid volume in saliva and divided it by the number of particles from a sneeze and a cough to get a distribution of particles. This, coupled with the data from the computational fluid dynamics model, allowed the researchers to compute the number of collectable bioparticles, says Hwang.
  • The researchers found that contamination traveled farther in sneezing than in coughing cases, and that particles from the two window-seat passengers entered the outlet vents quickly and were the least circulated in the cabin. In contrast, particles from the three passengers in the center row lingered and were not transported as effectively as particles exhaled from passengers in the two aisle seats of the aircraft's two outside rows.
  • For the purposes of the study, the researchers assumed that they had approximately 90 minutes to detect a virus. That's about the length of time that it takes to fly from Vancouver to San Francisco--a flight that often carries passengers who have just arrived from Asia.
  • Gendreau cautions that while the study did use sophisticated modeling techniques, the researchers did make assumptions about the super spreaders: "We don't have a good idea of super spreaders' characteristics." However, the Center for Disease Control is putting a lot of money into addressing such knowledge gaps, and MITRE's study is a nice start, says Gendreau.
  • The MITRE researchers also determined that to detect the presence of viruses, ultrasensitive biosensors are necessary. "The particles are small and dispersed, so you need detection down to the single particle level," says Harkin. Currently, there are no commercial biosensors that can do that. Hwang and researchers at the University of California, San Diego, are building a novel surface plasmon polariton biosensor that has performed single molecule resolution in the laboratory.
  • The sensor uses a plasmonic substrate with a gold surface that is perforated with nanometer-wide holes. A glycoprotein is attached to the gold surface inside each hole, and the researchers monitor the resonance of the photons that get transmitted through the gold nanohole. When a pathogen like H1N1 or H1N5 binds to the glycoprotein, the resonance changes. The work was featured in Nature earlier this year.

A Laptop Cooled with Ionic Wind

http://www.technologyreview.com/computing/22668/?nlid=2037
Anyone who uses a laptop will be familiar with the whir that the fan makes as it kicks in when the processor's temperature reaches around 100 °F. As laptops and other electronics have gotten smaller and thinner, researchers have begun searching for alternative cooling methods, which add less bulk and are quieter.
  • One novel idea is to cool a system by using ions to push air molecules across a hot microprocessor, thereby creating a cooling breeze. So-called ionic-cooling systems have been demonstrated in research labs before, but now Tessera, an international chip-packaging company based in San Jose, CA, has demonstrated an ionic-cooling system integrated into a working laptop.
  • Researchers from Tessera and the University of Washington presented details of the ionic-cooling system at the IEEE Semi-Therm Symposium in March. The system can extract roughly 30 percent more heat from a laptop than a conventional fan can, and lab tests show that it could potentially consume only half as much power, the company says.
  • The ionic-cooler is based on work originally done in 2006 by Alexander Mamishev, a professor of electrical engineering at the University of Washington, and his colleagues. Last year, Tessera licensed the technology, and the company has since modified it to fit into a laptop. In addition to removing heat more efficiently than a fan, "it has silent operation--no moving parts," Mamishev says. "This is a big milestone."
  • Tessera's ionic cooler sits near a vent inside the laptop. Heat pipes, which transfer heat using the evaporation and condensation of a fluid, draw heat away from the computer's processing units and toward the ionic-cooling system.
  • Inside the ionic-cooling device are two electrodes: one that ionizes air molecules such as nitrogen, and another that acts as a receiver for those molecules. When a voltage is applied between the two electrodes, the ions flow from the emitter electrode to the collector. As they move, their momentum pushes neutral air molecules across a hot spot, cooling it down.
  • One of the main challenges of integrating an ionic-cooling system into a laptop was designing a sufficiently compact voltage converter capable of converting the laptop battery's 12 volts DC into the approximately 3,000 volts required to operate the cooler. Using a power supply from a cold cathode fluorescent lamp, engineers at the company were able to construct a supply that is only three centimeters square.

  • Tessera isn't the only company looking at ionic breeze as a means to cool consumer electronics. Researchers at Garimella's own lab at Purdue have demonstrated a similar technology, which is being developed commercially by an early-stage Silicon Valley startup called Ventiva.

  • Neither technology is quite ready for the next generation of laptops, though. A major challenge will be ensuring the reliability of the electrodes. Laptops are built to operate for at least 30,000 hours, and in early tests of the ionic-cooling system, certain electrode materials corroded too quickly. Without giving specifics, due to pending patents, Honer says that engineers at the company have identified better materials and are focusing on optimizing their lifetime.

  • Another hurdle for the technology is the accumulation of dust. Honer says that his engineers are trying to make sure that the ionic cooler is "as insensitive to dust as a fan." He adds that one way to protect the cooler from potentially damaging particles is to use a prefilter.

Thursday, May 7, 2009

'Self-monitoring device' for HIV

People living with HIV could soon monitor their own condition at home using a hand-held device, similar to ones used by diabetics .
  • Scientists at three of London's largest research centres have been granted £2m to develop a hi-tech, finger prick blood-testing gadget.
  • The device's tiny mechanical sensors - microcantilever arrays - measure HIV levels to warn of impending flare ups.
  • A display then alerts the user if there is any need for them to visit a doctor.
  • Investigator Dr Anna-Maria Goretti, an NHS consultant and co-investigator based at the Royal Free Hospital, said: "If patients neglect to take their treatments or need prompting to see their GP the device will provide a simple way of letting them know.

  • "It will really empower HIV patients to keep a close eye on their health and their treatments."

  • Instead of routinely seeing a specialist every three or so months "just in case", they would only need to see their doctor when things were going wrong

  • As well as reducing visits to the doctor, it could also be of real benefit in developing countries where rapid and affordable ways to monitor HIV patients are urgently needed, say the researchers.

  • The microcantilever arrays are each coated with substances that stick to the HIV and other proteins, which are markers associated with disease progression.

  • Accommodating these markers causes the highly-sensitive sensors to bend like a diving board and this bend indicates the level of virus in the body, explained lead investigator Dr Rachel McKendry of University College London and the London Centre for Nanotechnology.

  • "We have used microcantilever arrays to investigate drug resistance in superbugs such as MRSA, and are excited by the opportunity to extend this approach to detecting HIV markers," she said.

  • Dr McKendry is working with Imperial College London, Cambridge Medical Innovations, Sphere Medical Ltd and BionanoConsulting on the three-year project to develop the prototype hand-held device for clinical trials.

  • Lisa Power of the Terrence Higgins Trust said: "This is certainly a very good idea. If you have diabetes you can check your blood sugar levels.

  • "Similarly, it would be very useful if HIV patients could check their own viral measures, say, once a month."

  • "It would not replace specialist advice, but it would be a way to reduce a patient's dependence on doctors."