NIH Funding Research on the Effect of H1N1 on Pregnant Women COLUMBIA, MO (KBIA) - "The trimester in which they are doing the trial is second and third trimester is likely because most of the organ formation within the baby is in the first trimester."

The women receive two different doses of the vaccine 21 days apart and will have blood drawn at various points to determine if their immune systems responded. State Health Department Spokesman Kit Wagar says the trial is now safe to perform on high risk groups.

"The first group of people were healthy adults. We want to see how this vaccine works. Then they can start moving to other specific groups such as children and now pregnant women."

The trial will also collect cord blood once the babies are born to measure any maternal antibodies passed to the infants. © Copyright 2012, KBIA