Navigation Links
Study Questions Flu Shot's Value for Older People
Date:9/25/2007

Most trials don't even include people over 70, researchers note

TUESDAY, Sept. 25 (HealthDay News) -- The ability of flu shots to reduce the risk of influenza-related death among people 65 and older may be greatly exaggerated, say researchers who reviewed the available scientific evidence.

This exaggeration is the result of "frailty selection bias" -- where not-so-frail older people are vaccinated more often than those who are infirm, the team said. It's also due to the use of non-specific clinical trail endpoints, such as death from any and all causes, wrote a group led by Dr. Lone Simonsen, of George Washington University in Washington, D.C.

They reported their conclusions in the October issue of The Lancet Infectious Diseases journal.

The researchers noted that few clinical trials of flu vaccines have included seniors, especially those aged 70 and older -- the age group that accounts for 75 percent of all influenza-related deaths. Those studies that have been conducted with seniors suggested a steady decline in clinical benefits and vaccine antibody responses after age 70.

The review authors also found that, even though vaccination rates increased from 15 percent to 65 percent since 1980, studies have not been able to confirm a corresponding decline in flu-related deaths.

"Paradoxically, whereas those studies attribute about five percent of all winter deaths to influenza, many cohort studies report a 50 percent reduction in the total risk of death in winter -- a benefit ten times greater than the estimated influenza mortality burden," the review authors wrote.

Future studies on flu vaccines in older groups should use more specific endpoints and actual virus surveillance data for each flu season, rather than the current arbitrary four-month period, the team added.

Despite the current lack of evidence, the review authors do recommend that seniors continue to get flu shots.

"While awaiting an improved evidence base for influenza vaccine mortality benefits in elderly people, we suggest that this group should continue to be vaccinated against influenza. Influenza causes many deaths each year, and even a partly effective vaccine would be better than no vaccine at all," they said. "But the evidence base concerning influenza vaccine benefits in elderly people does need to be strengthened."

More information

The U.S. National Institute on Aging has more about older people and the flu.



-- Robert Preidt



SOURCE: The Lancet, news release, Sept. 25, 2007


'/>"/>
Copyright©2007 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Rural Canadians travel far for specialists: study
2. A new study surpasses Gene Therapy Hurdle
3. Tomato Sauce reduces Cancer Risk- Study
4. A question on study of Adult Stem Cell
5. Study on obesity and heart failure
6. National Lung Study in the process
7. Marijuana gateway theory strengthened by study of twins
8. Old theory of adaptation confirmed by new study
9. Study casts doubt on keyboard ills
10. Gene study links endometriosis, infertility
11. Study reveals how stress can make you sick
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... ... October 13, 2017 , ... ... certification process to promote standards of excellence for the field of eating disorders, ... March 22 – 25, 2018 in Orlando, Florida at the Omni Resort at ...
(Date:10/13/2017)... LUIS OBISPO, Calif. (PRWEB) , ... October 13, 2017 , ... ... Alzheimer’s or dementia. However, many long-term care insurance companies have a waiver for care ... is the 90-day elimination period, when the family pays for care, is often waived, ...
(Date:10/13/2017)... ... October 13, 2017 , ... Talented host, ... lowdown on sciatica in a new episode of "Success Files," which is an ... and innovation and investigates each subject in-depth with passion and integrity. , Sciatica ...
(Date:10/12/2017)... ... October 12, 2017 , ... CitiDent and San Francisco ... using cutting-edge Oventus O2Vent technology. As many as 18 million Americans are estimated ... in breathing. Oral appliances can offer significant relief to about 75 percent of ...
(Date:10/12/2017)... ... , ... Asante, a nationally recognized health system in southern ... home health joint venture through an agreement, effective October 1, 2017, to create ... health company with Asante, delivering clinically integrated care, for the past eight years. ...
Breaking Medicine News(10 mins):
(Date:10/4/2017)... , Oct. 4, 2017 ... single-use, self-contained, illuminating medical devices, today announced regulatory ... Health Surveillance Agency (or Agência Nacional de Vigilância ... first single-use, cordless surgical retractor with integrated LED ... optimal access, illumination and exposure of a tissue ...
(Date:10/2/2017)... COPENHAGEN, Denmark , Oct. 2, 2017 The ... tool in the struggle to reverse the tide of prescription ... plan for regulating their medicine intake and stepping down their ... is set to launch in December 2017; the first 100,000 ... access. Learn more at http://www.rebound-solution.com/ ...
(Date:9/25/2017)... --  Montrium , an industry leader in powerful ... Trial Master Files & Inspection Readiness Conference ( ... Services has selected eTMF Connect to ... a leading European contract research organization (CRO), will ... enable greater collaboration with sponsors, improve compliance and ...
Breaking Medicine Technology: