Assertion: vaccine | /r/HasProperty | required
Facets:
value: normally
type: DEGREE
Source sentences:
text: A clinical trial for an experimental coronavirus vaccine has begun recruiting participants in Seattle, but researchers did not first show that the vaccine triggered an immune response in animals, as is normally required.
text: The subunits vaccines, which are based on the cell surface of the virus or bacteria are generally safer, but may not deliver a strong enough immune response and booster vaccines may be required.