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Still, the apparent disproportionate impact of H1N1 on pregnant women is not surprising, given the body changes that occur during pregnancy, she said.
CNN: Study: H1N1 virus more severely affects pregnant women
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She has chosen 51 genes to study, including those involved in the body's responses to stress and infection, in hormonal changes related to pregnancy, and in ways in which the body handles a wide variety of environmental toxins.
BBC: Gene clue to pregnancy riddle
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In a special sequence, filmed every three weeks, we see in less than a minute how Philippa's body changes over the nine months of pregnancy.
BBC: The miracle of being
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The programme also shows the early effects of pregnancy on the mother's body: painful, swollen breasts and nausea.
BBC: The miracle of being
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In August, Missouri Senate candidate Todd Akin almost derailed his own campaign when he said that in cases of "legitimate" rape, "the female body has ways to try to shut that whole thing down" and avert pregnancy.
BBC: Republican Senate hopeful Richard Mourdock in rape row
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"A pregnant woman has to accommodate this foreign body of the growing fetus, so there is an immunological shift that occurs in pregnancy, " she said.
CNN: Study: H1N1 virus more severely affects pregnant women
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During pregnancy oestrogen and progesterone levels rise to support the growing baby and to prevent a women's body from rejecting it.
BBC: Pregnancy - the 'miracle' cure?