Skip to content

Cold, Flu, & Cough Health Center

Little Risk of Guillain-Barré With H1N1 Flu Vaccine

Concerns About Vaccines, Guillain-Barré Syndrome Span Decades
Font Size
A
A
A
By
WebMD Health News
Reviewed by Laura J. Martin, MD

July 15, 2011 -- A new study affirms that the 2009 H1N1 flu vaccine, developed to counter the flu pandemic, does not substantially put people at increased risk of Guillain-Barré syndrome. Guillain-Barré syndrome is a disorder in which a person's immune system damages nerves, causing weakness and in some cases paralysis.

The study, conducted at five centers throughout Europe, was published in the latest issue of BMJ.

The concern about Guillain-Barré dates back 35 years. That’s when a vaccine with an added substance called an adjuvant, which stimulates the immune system, appeared to make users of the vaccine seven times more likely to develop the disease. That vaccine, developed by the United States, was withdrawn. Although adjuvanted vaccines developed after 1976 have shown no similarly heightened risk, concern about their safety has remained high.

“Even though the studies repeatedly showed risk estimates well below the sevenfold increase of 1976, they do not provide reassurance that there is no increase in risk after seasonal influenza vaccination,” the authors write.

Guillain-Barré, a rare disorder that affects one to two people out of 100,000, has no known cause. However, about half of all cases occur after a viral or bacterial infection. Weakness and tingling in the legs are early symptoms of the disease. In severe cases, the disorder causes total paralysis and unassisted breathing becomes impossible. Recovery can take from a few weeks to a few years, and a small number of people with the disorder will experience a relapse.

GBS and Swine Flu Vaccine

For the study, researchers in Denmark, France, the Netherlands, Sweden, and the U.K. combed through the health records of approximately 50 million people for the period between November 2009 and March 2010. They were looking for cases of Guillain-Barré syndrome and a variant of the disorder known as Miller-Fisher syndrome. They found 154.

After adjusting for various factors, the study team concluded that there were three cases of Guillain-Barré syndrome for every 1 million people vaccinated with adjuvanted vaccines. In 1976, there had been one case per 100,000 people who were vaccinated.

Today on WebMD

hot toddy
15 tips to help you feel better.
man sneezing into elbow
Do echinacea and vitamin C really help a cold?
 
teen girl coughing
Get a good night’s rest with these remedies.
elder berry
Eat these to fight colds, flu, and more.
 
Natural Cold Flu Remedies Slideshow
Slideshow
cold weather
VIDEO
 
Allergy And Sinus Symptom Evaluator
Article
Boy holding ear
Slideshow
 

Loaded with tips to help you avoid food allergy triggers.

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

woman receiving vaccine shot
Article
woman with fever
Article
 
Waking up from sleep
Article
woman with sore throat
Slideshow