Assertion: vaccine's virus | /r/HasProperty | provided to the manufacturer
Facets:
Source sentences:
text: While viruses used in Flucelvax Quadrivalent have been grown in cells since the vaccine first became available, prior to the 2019-2020 season some of the viruses provided to the manufacturer had been originally derived in eggs.
text: For the 2019-20 season, the viruses provided to the manufacturer to be grown in cell culture are cell-derived rather than egg derived.