Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Cold, Flu, & Cough Health Center

Font Size

Swine Flu Vaccine Protects Pregnant Women

1 Dose of H1N1 Vaccine Works for Pregnant Women; Kids Still Need 2 Doses
WebMD Health News
Reviewed by Louise Chang, MD

Nov. 2, 2009 - Pregnant women safely get "robust" protection from one dose of the H1N1 swine flu vaccine; but children under age 10 really need two doses, NIH studies show.

The findings are straight-from-the-clinic data from ongoing studies funded and coordinated by the National Institute of Allergy and Infectious Diseases (NIAID) at clinical centers across the country.

"This should be reassuring news to those women who already have received the H1N1 vaccine, and it is vital information for those pregnant women who have not been vaccinated," NIAID Director Anthony Fauci, MD, said at a news conference. "Importantly, the pregnant women participating in the trial have tolerated the vaccine well and no safety concerns have arisen."

As the current wave of the H1N1 swine flu pandemic sweeps the nation, it's becoming clear that pregnant women -- especially those in their second and third trimesters -- bear a special risk. They are about six times more likely than other healthy adults to develop severe complications soon after infection with H1N1 swine flu.

Alarmingly, a recent CDC survey found that about half of pregnant women and other adults with risk conditions do not seek medical attention when they come down with H1N1 swine flu symptoms.

It's also becoming increasingly clear that H1N1 swine flu is mainly a disease of young people. Children, teens, and young adults bear the brunt of infections -- and of hospitalizations and deaths.

The NIAID clinical trials have shown that children, teens, and young adults over age 10 need just one dose of the H1N1 swine flu vaccine for protection.

Early results from these studies suggested younger children might need two doses. That's true, new study results show.

Even three weeks after getting their first dose of H1N1 swine flu vaccine, only 25% of kids ages 6 to 35 months and only 55% of kids ages 3 to 9 years are protected. Even giving these kids a one-time double dose did not improve immune responses.

The good news: Just eight to 10 days after getting their second dose of the vaccine -- four weeks after the first dose -- virtually every kid in these age groups has a protective immune response.

"These data support guidelines that recommend two vaccine doses for younger children," Fauci said.

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
cold weather
Allergy And Sinus Symptom Evaluator
Boy holding ear
woman receiving vaccine shot
woman with fever
Waking up from sleep
woman with sore throat