Washington: A study has found that Norwegian pregnant women who received a vaccine against the 2009 H1N1 influenza virus showed no increased risk of pregnancy loss, while expectant mothers who experienced influenza during pregnancy had an increased risk of miscarriages and still births.The study suggests that influenza infection may increase the risk of fetal loss.Scientists at the U.S. National Institutes of Health and the Norwegian Institute of Public Health (NIPH) conducted the research following the H1N1 influenza pandemic that took place between spring 2009 and fall 2010. The researchers at the NIH were from the National Institute of Environmental Health Sciences (NIEHS).Norwegian public health officials had urged pregnant women to be vaccinated. However, media reports of pregnancy losses after flu shots caused some expectant mothers to forgo vaccination.First author Siri Haberg, M.D., Ph.D., of the NIPH and colleagues initiated the study to help address the question of vaccine safety, by taking advantage of Norway`s excellent registries and medical records system. Haberg spent one year of her postdoctoral fellowship in the NIEHS Epidemiology Branch before returning home to Norway during the pandemic.
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