Assertion: vaccine's thimerosal | /r/HasProperty | preservative
Facets:
Source sentences:
text: The shingles vaccine does not contain thimerosal (a preservative containing mercury).
text: Thimerosal is a preservative that contains mercury.
text: Thimerosal is a preservative that was found in most vaccines in the past.
text: Before 2001, some vaccines contained thimerosal, a preservative made with ethyl mercury.