Assertion: flu vaccine | /r/HasProperty | updated
Facets:
value: each season
type: TEMPORAL
value: each year
type: TEMPORAL
value: annually
type: TEMPORAL
Source sentences:
text: Flu vaccines are updated each season as needed to keep up with changing viruses.
text: Second, because flu viruses are constantly changing, flu vaccines may be updated from one season to the next to protect against the viruses that research suggests may be most common during the upcoming flu season.
text: The 2019-2020 flu vaccine has been updated from last season’s vaccine to better match circulating viruses.
text: Antigenic drift in human flu viruses is what causes the changes in seasonal flu viruses each year and is why the seasonal flu vaccine must be updated annually.
text: This region varies season to season, which is why flu vaccines must be updated each year.