Assertion: hepatitis b vaccine | /r/HasProperty | appreciated
Facets:
value: subsequently
type: TEMPORAL
Source sentences:
text: However, it was previously believed and suggested that the vaccination would only provide effective coverage of between five and seven years, but subsequently it has been appreciated that long-term immunity derives from immunological memory which outlasts the loss of antibody levels and hence subsequent testing and administration of booster doses is not required in successfully vaccinated immunocompetent individuals.