Assertion: live variola virus | /r/ObjectUse | used as target
Facets:
value: for neutralization assays
type: PURPOSE
value: by vaccinee sera
type: OTHER
Source sentences:
text: Live variola virus has been used as a target for neutralization assays by vaccinee sera , as a surrogate to understand how the immune response elicited by these vaccines compares with the historic vaccines or the newer versions of vaccines directly derived from the historic vaccines.