UNDATED (WKOW) - Federal health officials are strongly encouraging women who are pregnant to get vaccinated for the H1N1 virus.
The World Health Organization says since the flu was first detected last Spring, H1N1 has developed a more severe form that attacks the lungs.
Medical experts say women are especially vulnerable.
"Your immune system is so weak, and the flu affects you differently when you are pregnant, it really knocks you down," says Dr. Jacques Moritz of Roosevelt Hospital.
Many pregnant woman have expressed concern about the safety of the vaccine which is still being tested.
The government expects some doses to be available by Mid-October.
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