And while some people warn about the presence of mercury containing compounds like thimerosal, a vaccine preservative to prevent bacterial growth, it's actually been removed from almost all childhood vaccines since 2001.

虽然有些人警告说，含有汞的化合物，如硫柳汞，是一种疫苗防腐剂，可以防止细菌生长，但实际上，自2001年以来，几乎所有的儿童疫苗都不再含有硫柳汞。