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The FDA is continuing its efforts to reduce the exposure of infants, children, and pregnant women to mercury from various sources. Discussions with the manufacturers of influenza virus vaccines (which are now routinely recommended for pregnant women and children 6-23 months of age) regarding their capacity to potentially increase the supply of thimerosal-reduced and thimerosal-free presentations are ongoing. Discussions are also underway with regard to other vaccines. Of note, all hepatitis B vaccines for the U.S., including for adults, are now available only as thimerosal-free or trace-thimerosal-containing formulations. In addition, all immune globulin preparations including hepatitis B immune globulin, and Rho(D) immune globulin preparations are manufactured without thimerosal. For additional information on the issue of thimerosal in vaccines, see Frequently Asked Questions (FAQs).