Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

UCSD Study Shows Increased Transmission Of Drug-Resistant HIV Infection

08.08.2002


An increase in the transmission rate of drug-resistant human immunodeficiency virus (HIV), now affecting as many as one in five newly infected persons, has been discovered by researchers at the University of California, San Diego (UCSD) School of Medicine.



In a five-year, multi-center study of more than 300 patients in 10 North American cities, the investigators found that the transmission rate of drug-resistant HIV had more than doubled, resulting in impaired patient-response once anti-retroviral therapy was provided. The results are published in the August 8, 2002 issue of the New England Journal of Medicine.

According to lead author Susan Little, M.D., UCSD assistant professor of medicine, and senior author Douglas Richman, M.D., UCSD professor of medicine, resistance was noted in persons on single-drug therapy as well as those receiving potent multi-drug treatment.


"This points to the importance of routine drug-resistance tests for newly infected patients so that the most effective first-line treatment program can be initiated," said Richman, who is director of the UCSD AIDS Research Institute and the Research Center for AIDS and HIV Infection at the Veterans Affairs (VA) San Diego Health Care System.

Although past studies had estimated the transmission of drug-resistant HIV at 1 to 11 percent of newly infected patients, the new findings show the prevalence of viral mutations associated with resistance increased from 8.0 percent between 1995-98 to 22.7 percent during 1999-2000.

From May 1995 through June 2000, 377 individuals with primary HIV infection who had not yet received treatment were recruited for the study. Study subjects were predominantly non-Hispanic white men whose risk factor for HIV infection was unprotected sex with men, a group in which HIV drug resistance appears to be most prevalent, the researchers said.

Pre-treatment blood samples were analyzed to determine clinical resistance to 15 currently approved HIV drugs. In addition, the blood samples were analyzed for resistance to multi-drug regimens.

Response to treatment was then measured in 202 of the patients. Investigators looked at the length of time to viral suppression and/or the time to virologic failure, when treatment was no longer effective. Although viral suppression was demonstrated by week 24 of therapy in all but one patient, the median time to suppression was 56 days for those without the drug-resistant strain and 88 days for those with the drug-resistant form of the virus. The time to virologic failure was significantly shorter among those with drug-resistance.

In research results presented by Richman in December 2001 at the American Society for Microbiology, it was noted that more than three-quarters of HIV patients with a measurable viral load who are receiving care in the United States carry strains of the virus that are resistant to drug therapy.

In the current New England Journal of Medicine article, Little, Richman and their team said that "increases in the prevalence of drug-resistant virus among patients with established HIV infection may be associated with more frequent transmission of drug-resistant virus to newly infected persons in their community."

The authors also noted that "in both the developed and developing worlds, the treatment strategies for patients newly infected with HIV should take into account the prevalence of transmitted drug resistance."

The study was funded by the National Institutes of Health. In addition to Little and Richman, authors were Sarah Holte, Ph.D., Fred Hutchinson Cancer Research Center, and Ann C. Collier, M.D., University of Washington; Jean-Pierre Routy, M.D., McGill University Health Center, Montreal; Eric S. Daar, M.D., UCLA Medical Center; Marty Markowitz, M.D., Aaron Diamond AIDS Research Center, New York; Richard A. Koup, M.D., Vaccine Research Center, National Institutes of Health; John W. Mellors, M.D., University of Pittsburgh School of Medicine; Elizabeth Connick, M.D., University of Colorado Health Sciences Center; Brian Conway, M.D., University of British Columbia, Vancouver; Michael Kilby, M.D., University of Alabama, Birmingham; and Jeannette M. Whitcomb, Ph.D., and Nicholas S. Hellmann, M.D., ViroLogic, South San Francisco.


Media Contact:
Sue Pondrom
619-543-6164
spondrom@ucsd.edu

Sue Pondrom | EurekAlert!
Further information:
http://health.ucsd.edu/news

More articles from Health and Medicine:

nachricht Spanish scientists create a 3-D bioprinter to print human skin
24.01.2017 | Carlos III University of Madrid

nachricht Tracking movement of immune cells identifies key first steps in inflammatory arthritis
23.01.2017 | Massachusetts General Hospital

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists spin artificial silk from whey protein

X-ray study throws light on key process for production

A Swedish-German team of researchers has cleared up a key process for the artificial production of silk. With the help of the intense X-rays from DESY's...

Im Focus: Quantum optical sensor for the first time tested in space – with a laser system from Berlin

For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.

According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Breaking the optical bandwidth record of stable pulsed lasers

24.01.2017 | Physics and Astronomy

Choreographing the microRNA-target dance

24.01.2017 | Life Sciences

Spanish scientists create a 3-D bioprinter to print human skin

24.01.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>