Navigation Links
Study calls for increased research in flu transmission to prepare for pandemic flu outbreak

PROVIDENCE, RI Researchers at Rhode Island Hospital have completed a study to better understand the impact of infection control measures during a possible flu pandemic. Their study focused on the likelihood of the transmission of flu from individuals showing no symptoms (asymptomatic) or from individuals who are infected but have not yet exhibited symptoms. The researchers call on the scientific community to better understand the transmission of influenza in order to provide guidelines for effective pandemic flu planning. Their findings are published in the March-April 2009 edition of Public Health Reports.

The study, from Rhode Island Hospital's department of epidemiology and infection control and the division of infectious diseases, notes that public health measures for controlling outbreaks involve isolation of symptomatic individuals and the quarantine of individuals with whom they have had contact. This intervention is dependent upon early identification of symptoms, and the success of the intervention can be limited by transmission that occurs prior to symptom onset and transmission from asymptomatic infection.

Senior author Leonard Mermel, DO, ScM, medical director of the department of epidemiology and infection control at Rhode Island Hospital, along with Eleni Patrozou, MD, performed a systematic review of literature on viral shedding and disease transmission. The review included animal studies, human studies, inoculation experiments, vaccine and antiviral drug efficacy studies, and observations during outbreaks.

Mermel says, "Our findings indicate that pre-symptomatic transmission of influenza has been inferred based on the presence of the virus in the upper respiratory tract rather than from the appropriate transmission experiments. This is troubling because our review of the literature does not support significant influenza transmission based on positive nasopharyngeal cultures in the absence of symptoms."

Their findings also indicate that small-particle aerosols expelled from infected individuals may play a greater role in influenza transmission than previously recognized. The problem, however, is that it remains unclear as to how many of these droplets are generated by asymptomatic or pre-symptomatic individuals.

Mermel adds, "Asymptomatic individuals may shed influenza virus, but studies have not conclusively determined if these individuals effectively transmit influenza to others. Our review of the literature suggests that the role of asymptomatic or pre-symptomatic influenza-infected individuals in disease transmission may have been overestimated in recent articles that have served as the basis for national and international pandemic planning."

He concludes, "Based on the historical record over the last century, we must be prepared for another pandemic. Our research tells us that a better understanding of transmission dynamics is essential if we are to develop effective influenza pandemic plans."


Contact: Nancy Cawley

Related medicine news :

1. Statins Pay Off on a Health-Policy Level, UCSF Study Finds
2. Major study on DiagnoCures GCC biomarker published in Jama
3. Dosing Begins in Phase 1 Clinical Study Evaluating NKTR-105 in Cancer Patients With Refractory Solid Tumors
4. Newly Published Menopause Study: Bioidentical and FDA-Approved Divigel(R) (estradiol gel) 0.1 Percent Safe and Effective Treatment for Moderate to Severe Hot Flashes Associated With Menopause
5. New Study Shares Benchmarks for Medical Science Liaisons: Gaining Access and Forging Relationships with Key Opinion Leaders
6. Study finds that using wakefulness tests to detect daytime sleepiness in drivers may be unreliable
7. Study finds behavioral link between insomnia and tension-type headaches
8. IMPACT Study Demonstrates That Longer Prophylactic Therapy With Valcyte(R) (Valganciclovir Hydrochloride Tablets) Increases Protection Against CMV - the Most Serious Viral Infection Affecting Transplant Patients
9. Sponsor Dollars Key to Flu Vaccine Study Publication
10. Tobacco Companies Targeting Teens, Study Says
11. New CDC Study Shows Tobacco Marketing Influences Kids to Smoke, Underscores Need for FDA Regulation of Tobacco Products
Post Your Comments:
(Date:11/24/2015)... ... ... Dr. Todd S. Afferica, a noted general dentist in Norcross, GA ... Afferica now uses the BIOLASE WaterLase iPlus 2.0™ in many of his dental procedures. ... traditional cutting tools, such as the scalpel and high-speed drill, which can both cause ...
(Date:11/24/2015)... ... November 24, 2015 , ... In an article published November ... determine which patients are or are not eligible for bariatric surgery. The article explains ... 40, are more than 100 pounds overweight, or have a BMI of 35 and ...
(Date:11/24/2015)... ... November 24, 2015 , ... It takes only three to five ... is critical that the first impression be positive and reflects business values. If a ... buy anything or want to return. They will also share their thoughts about a ...
(Date:11/24/2015)... ... 24, 2015 , ... Cancer patients, survivors, caregivers, family members ... live taping of the next CURE Connections® video series on Saturday, ... Symposium at Georgetown University Hotel & Conference Center in Washington, D.C. , CURE ...
(Date:11/24/2015)... ... November 24, 2015 , ... Aided by seed funding from the ... study designed to yield insights into how to detect and treat pancreatic cancer (PC). ... cancer from small, non-coding RNA molecules (ncRNA), genetic material that is present in the ...
Breaking Medicine News(10 mins):
(Date:11/24/2015)... The uptake of recently approved and pipeline premium products for Type 1 ... 2021, says GBI Research . --> ... Diabetes Mellitus (T1DM), will be a key driver of market growth to ... The uptake of recently approved and pipeline premium products for Type ... to 2021, says GBI Research . ...
(Date:11/24/2015)... Nov. 24, 2015  Enova Illumination is pleased to ... Helsinki, Finland to combine their world ... the cutting edge of medical visualization: Enova is the ... the United States and Novocam is the ... provide the world,s most powerful battery-operated LED headlight with ...
(Date:11/24/2015)... , Nov. 24, 2015  BioPlast Manufacturing, ... the medical research, clinical diagnostic and biotech environments, ... leading manufacturer of quality petri dishes. This acquisition ... clients a platform of products that are designed ... with the highest quality.  ...
Breaking Medicine Technology: