This chapter answers questions regarding the ingredients of vaccines. The CDC estimates that every year, about 200 people suffer severe allergic reactions to substances in vaccines. These substances include egg proteins, antibiotics, yeast proteins, and gelatin. the preservative in vaccines that has caused the most concern among parents of young children is thimerosal because it contains mercury. Although large quantities of mercury might be harmful to the nervous system, small quantities are not. Likewise, studies show that aluminum vaccines do not increase the amount of aluminum in the blood. Other studies have shown that the body eliminates aluminum quickly; in fact, about half of it is completely eliminated in one day. Some viral vaccines are also made using animal cells. One animal product in vaccines that is present in fairly large quantities is gelatin, which comes from the skin or hooves of pigs.
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