Pregnant Women Especially Vulnerable to Swine Flu

Pregnant women may be reluctant to receive vaccines, especially brand-new ones, while they're expecting, but today, mom-to-be Sivan Berman-Marciano said she'll opt for a swine flu vaccination if her doctor recommends it.

"If it's going to help not to have the swine flu and keep my baby safe, I will take it," Berman-Marciano said.

"I'm much more worried now than I was before getting pregnant because now, it's not only me, it's the baby also," she added.

Today, many doctors say that's the right move and argue that pregnant women should be given first dibs if a swine flu vaccine becomes available as expected this fall.

VIDEO: Expecting Mothers Very Vulnerable to H1N1
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Watch "World News With Charles Gibson" tonight at 6:30 ET for the full report.

The conversation comes as a federal vaccine advisory panel meets tomorrow to further discuss who should receive top priority for the swine flu vaccine. It also coincides with increasing concerns that pregnant women are particularly vulnerable to the pandemic.

Any flu virus can be dangerous for a pregnant woman, but swine flu appears to be especially threatening.

According to data from the Centers for Disease Control and Prevention, 15 out of 266 swine flu deaths in the U.S. so far have been among pregnant women. That's 6 percent of total fatalities, even though pregnant women only make up 1 percent of the population.

The flu can be particularly deadly in the second and third trimester of pregnancy, both for mother and baby.

Today, Dr. Jacques Moritz, director of gynecology at New York's St.Luke's Roosevelt Hospital, said that's because a pregnant woman's weakened immune system makes her especially susceptible to the virus.

"What the body does, and what the baby does, really, is it sends out a message, 'Don't get rid of me,'" Moritz said. "So it brings down the immune system, so you don't reject the fetus."

He added, "Anybody that is going to be pregnant, in the second or third trimester during this upcoming flu season, should get vaccinated before, obviously, the flu season."

Visit the ABC News OnCall+ Swine Flu Center to get all your questions answered.

Learn about swine flu's symptoms and find out if you need to see a doctor.

Pregnant Women Have Already Battled Swine Flu

The first American to die of swine flu was a 33-year-old pregnant woman in Texas. Her baby girl, delivered by caesarian, survived.

Near Seattle, 27-year-old Katie Flyte is fighting for her life after complications from swine flu. Flyte was six months pregnant and caring for her sick 2-year-old when she developed flulike symptoms that were misdiagnosed. She developed pneumonia, then respiratory failure, as doctors rushed to save her premature daughter.

"I've got to give my baby girl a name without a mom to help me make the decision," Katie's husband, Kenny Flyte, told KOMO News last week.

Meantime, in Australia, doctors are urging pregnant women to stay home during this swine flu season to avoid contact with anyone suffering from the illness. In Great Britain, this fall, there may be advice to pregnant women is to avoid large social gatherings.

Today Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health, said it's "understandable" that pregnant women are hesitant to get vaccinated.

"That's a natural reflex, but you have to understand the balance of the risk of a vaccination," Fauci added.

Given his heartbreaking experience, Kenny Flyte advises women who are expecting to act quickly if they feel sick.

"Go see your doctor," Flyte said. "Don't even play around."

Clinical Trials for Vaccine to Start in August

Fauci said today that health officials "appear to be having no trouble getting people signing up as volunteers" for clinical trials expected to begin in August to test the vaccine.

The clinical trials for a vaccination are expected to be followed by a voluntary vaccine program, anticipated to begin mid-October.

That vaccine program would be limited at first to those most susceptible to the virus. Those first in line to receive the series of two shots would likely be children, teenagers, health workers and pregnant women. The vaccine would be purchased by the federal government and distributed to state and local health departments.

Youth have also been hard hit in the swine flu outbreak, making school district preparation key to prevention.

Earlier this month, federal, state and local health officials gathered at a swine flu summit to size up what needs to happen to prepare for and prevent a second round of swine flu illnesses at the beginning of the upcoming school year like the ones that hit the world this spring.

At that time, Health and Human Services Secretary Kathleen Sebelius called on all states to update their emergency plans, including ways to carry out a mass vaccination program.

"We want to start re-engaging the American public and our state and local and health and private business partners in making sure we use these summer months well to prepare for what could be a serious outbreak," Sebelius said. "If it doesn't happen, we'll be fortunate and this planning won't go to waste."

ABC News' Olivia Hallihan contributed to this report.

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