Navigation Links
New Research Demonstrates High Prevalence of Sexually Transmitted Disease Trichomonas Vaginalis and Potential of New Molecular Test to Improve Detection

SAN DIEGO, July 13, 2011 /PRNewswire/ -- Two new studies presented this week at a leading infectious disease meeting demonstrate that sexually transmitted disease (STD) caused by the parasite Trichomonas vaginalis is more common than previously thought, especially in women over 40, and that a recently cleared molecular test can help improve detection of the often overlooked but potentially serious infection.

"This new research shows that Trichomonas is an important public health issue, especially in women over 40," said Ingo Chakravarty, Gen-Probe's vice president and general manager for women's health.  "We believe our APTIMA® Trichomonas assay, which was cleared by the FDA in April for use on the fully automated TIGRIS® system, can play an important role in highlighting the prevalence of the STD and intercepting infections before they cause serious complications."

The two studies were presented at the 19th Biennial Conference of the International Society for Sexually Transmitted Disease Research (ISSTDR), which ended today in Quebec City, Canada.

"Trichomonas is the Rodney Dangerfield of STDs – it gets no respect," said Kimberle Chapin, MD, professor of pathology and medicine at Brown Medical School in Providence, Rhode Island.  "If left untreated, Trichomonas infections can lead to prenatal complications such as premature membrane rupture during pregnancy, pre-term delivery and low birth weight offspring.  Trichomonas also has been associated with increased susceptibility to HIV, the virus that causes AIDS, and prolonged infection with the human papillomavirus, which causes cervical cancer.  Screening for Trichomonas is important because infections don't always cause symptoms, yet can be treated easily with antibiotics when detected."

In the first study presented at the ISSTDR meeting, researchers tested 7,593 women in 21 states with Gen-Probe's APTIMA Trichomonas assay, which detects the parasite's unique genetic code.  The women were between the ages of 18 and 89 and were scheduled for routine screening for Chlamydia and gonorrhea, the two most common bacterial STDs.  The study results were presented by senior study investigator Charlotte Gaydos, MS, DrPH, professor in the division of infectious diseases at the Johns Hopkins University School of Medicine in Baltimore, Maryland.

The overall prevalence of Trichomonas was 8.7% in the study, higher than the rate of Chlamydia (6.7%) and gonorrhea (1.7%) combined.  In contrast to the age distribution typically seen with Chlamydia and gonorrhea, Trichomonas was most common in women over 40, as shown here:AgeNTrichomonas +Chlamydia +Gonorrhea +Overall




















0.1%> 50




1.2%In the study, Trichomonas infections were much more common among black women (20.2%) than in whites (5.7%), Hispanics (5.0%) and Asians (3.8%).  By geography, trichomonas infections were most common in the Southeast (14.4%), compared to 9.5% in the Southwest and Midwest, and 4.3% in the Northeast.

The second study presented at the ISSTDR meeting was the clinical trial used to gain FDA clearance for Gen-Probe's APTIMA Trichomonas assay.

In the study, researchers tested 933 women attending nine OB-GYN, adolescent, family planning or sexually transmitted disease clinics in the United States.  Approximately 60% of the women reported symptoms commonly associated with Trichomonas infection.

Four specimen types were collected from each woman: physician-collected vaginal swabs, an endocervical swab, a PreservCyt liquid Pap specimen, and urine.  Each specimen was tested with the APTIMA Trichomonas assay on the TIGRIS system.  The vaginal swab specimens also were tested for Trichomonas using two traditional methods, "wet mount" microscopic examination and culture.  The patient was considered positive if the wet mount or culture tests were positive.  Study results are shown here:Specimen TypeNPrevalenceSensitivitySpecificityPPVNPV %Urine






99.4%Vaginal swab






100.0%Endocervical swab












100.0%"In this study, the sensitivity of the APTIMA Trichomonas assay was high in all specimens tested, and much higher than that usually reported for wet mount and culture, confirming results seen in smaller, head-to-head studies," said Jane Schwebke, MD, professor of medicine/infectious diseases at the University of Alabama at Birmingham.  "The APTIMA Trichomonas assay showed consistent performance in symptomatic and asymptomatic patients, in adolescent and adult women, and among specimen collection sites.  The availability of such a highly accurate, fully automated molecular assay that can be used to test easily obtained female specimens should facilitate large-scale screening for trichomonas."

About the APTIMA Trichomonas AssayThe APTIMA Trichomonas assay is the first amplified nucleic acid test specifically cleared to detect the most common curable sexually transmitted disease in the United States.  The assay may be used to test clinician-collected endocervical or vaginal swabs, urine, and specimens collected in PreservCyt solution from symptomatic or asymptomatic women.

Trichomonas is a sexually transmitted parasite that causes vaginitis, urethritis and cervicitis in women, and more serious complications if left untreated.  The US Centers for Disease Control estimate that 7.4 million American men and women are infected with Trichomonas annually.

Screening for Trichomonas is important because the infection often does not cause symptoms.  Unfortunately, screening is limited today due in part to the shortfalls of current testing techniques.  Most testing currently is done via culture methods, which are slow and less sensitive than molecular tests, or "wet mount," which requires the microscopic examination of a sample shortly after it is collected and is even less sensitive than culture.

About Gen-ProbeGen-Probe is a global leader in the development, manufacture and marketing of rapid, accurate and cost-effective molecular diagnostic products and services that are used primarily to diagnose human diseases, screen donated human blood, and ensure transplant compatibility.  Gen-Probe is headquartered in San Diego and employs approximately 1,400 people. For more information, go to

Caution Regarding Forward-Looking StatementsAny statements in this press release about Gen-Probe's expectations, beliefs, plans, objectives, assumptions or future events or performance are not historical facts and are forward-looking statements.  These statements are often, but not always, made through the use of words or phrases such as believe, will, expect, anticipate, estimate, intend, plan and would.  For example, statements concerning new products, customer adoption, and future sales are all forward-looking statements.  Forward-looking statements are not guarantees of performance.  They involve known and unknown risks, uncertainties and assumptions that may cause actual results, levels of activity, performance or achievements to differ materially from those expressed or implied.  These risks, uncertainties and assumptions include, but are not limited to: (i) the risk that the market for the sale of our new products, such as our APTIMA Trichomonas vaginalis assay, may not develop as expected; (ii) the risk that we may not be able to compete effectively; and (iii) the risk that future R&D studies will not be positive.  The foregoing describes some, but not all, of the factors that could affect our ability to achieve results described in any forward-looking statements.  For additional information about risks and uncertainties we face and a discussion of our financial statements and footnotes, see documents we file with the SEC, including our most recent annual report on Form 10-K and all subsequent periodic reports.  We assume no obligation and expressly disclaim any duty to update any forward-looking statement to reflect events or circumstances after the date of this news release or to reflect the occurrence of subsequent events.

Contact:Michael Watts

Vice president, investor relations and

corporate communications


SOURCE Gen-Probe
Copyright©2010 PR Newswire.
All rights reserved

Related medicine technology :

1. The Multiple Myeloma Research Consortium (MMRC) and Proteolix Initiate Phase 2 Clinical Trial Investigating Carfilzomib for the Treatment of Multiple Myeloma
2. Multiple Myeloma Research Consortium (MMRC) Partners with Novartis to Advance Phase II Study of Deacetylase Inhibitor
3. Lexicon to Present Research Results at American Chemical Society Meeting Regarding Target of LX1031 Drug Candidate
4. Researchers at Cleveland Clinic Identify Site of Dysfunction in HDL, Carrier of Good Cholesterol
5. Video: New Research Discovers Independent Brain Networks Control Human Walking
6. Quark Pharmaceuticals Extends Research Agreement with State University of New York for Proprietary siRNA Compounds for Acute Hearing Loss
7. Cleveland Clinic Researchers Identify Mechanism Behind Platelet Function and Potentially Fatal Blood Clot Formation
8. HistoRx and Radiation Therapy Oncology Group Initiate Brain Tumor Biomarker Research Partnership
9. Diabetes Research Institute Invention Promotes Growth of Stem Cells into Insulin-Producing Cells
10. Researchers Identify Virus Possibly Responsible for Declining Honeybee Population Using 454 Sequencing Technology from Roche
11. Peregrine Researchers Report Data Showing Bavituximabs Potential to Shrink Human Prostate Tumors in Model of Relapsed Disease
Post Your Comments:
(Date:10/2/2017)... Fla. , Oct. 2, 2017  AllianceRx Walgreens ... company formed by Walgreens and pharmacy benefit manager Prime ... its new brand, which included the unveiling of new ... , as well as at a few other ... the new brand to patients, some of whom will ...
(Date:10/2/2017)... The Rebound mobile app is poised to become a vital ... prescription drug addiction. The app empowers users to develop an ... their dosage in a safe, controlled manner while maximizing well-being. ... 100,000 people to sign up will enjoy 3 months of ... ...
(Date:9/28/2017)... Sept. 28, 2017 Cohen Veterans Bioscience and ... use of wearable and home sensors for real-time monitoring ... Signal Foundation, a nonprofit organization focused on disruptive health ... an affordable analytical system to record and integrate behavioral, ... ...
Breaking Medicine Technology:
(Date:10/13/2017)... ... 13, 2017 , ... Many families have long-term insurance that covers care for ... a waiver for care if the client has a cognitive impairment diagnosis. , ... care, is often waived, so the benefits from their insurance start immediately,” said Mechell ...
(Date:10/13/2017)... ... , ... Talented host, actor Rob Lowe, is introducing a ... episode of "Success Files," which is an award-winning educational program broadcasted on PBS ... in-depth with passion and integrity. , Sciatica occurs when the sciatic nerve in ...
(Date:10/12/2017)... Francisco, CA (PRWEB) , ... October 12, 2017 ... ... Dr. Cheng, are now treating sleep apnea using cutting-edge Oventus O2Vent ... apnea, a serious sleep disorder characterized by frequent cessation in breathing. Oral appliances ...
(Date:10/12/2017)... , ... October 12, 2017 , ... ... a leader in post-acute health care, have expanded their existing home health joint ... Health. , AccentCare has been operating a joint venture home health company with ...
(Date:10/12/2017)... ... 2017 , ... On Saturday, October 21, the Health & Wellness Center at ... raise money for the American Heart Association Heart Walk. Teams of up to 10 ... to keep their treadmills moving for 5 hours. Treadmills will start at 7:00 p.m. ...
Breaking Medicine News(10 mins):