Benefit and doubt in vaccine additive. Additives could stretch the supply of swine flu vaccine. But U.S. officials have doubts about the substances’ safety--and are worried about using an unproven vaccine to help protect people in other countries. [News Source]

Pregnant women bare arms for H1N1 vaccine. As of Sept. 3, 6% of confirmed deaths from the H1N1 flu have been pregnant women, the Centers for Disease Control and Prevention says. And among people infected with H1N1, pregnant women are more likely to be hospitalized than the general population. [News Source]