During the 1990s, the U.S. government greatly expanded its infant immunization schedule, which simultaneously increased the amount of mercury being injected into children with each new vaccination. Here's a look at the vaccines that were added between 1990 and 2000 and how much thimerosal each contained. YEAR VACCINE THIMEROSAL CONTENT
1991 HiB (haemophilus influenzae) 25 micrograms
1992 Hepatitus B 12.5 micrograms
1995 Varicella (chickenpox) 0
1998 Rotavirus 0
2000 Prevnar (pneumococcal conjugate) 0
SOURCE: The Institute for Vaccine Safety at Johns Hopkins University in Baltimore
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