Assertion: variola virus | /r/HasProperty | essential
Facets:
value: for developing smallpox therapeutics
type: PURPOSE
Source sentences:
text: Furthermore, while studies with these recombinants might contribute to understanding of variola pathogenesis, such investiga- tions could not substitute for those using variola virus and would have to be carried out in BSL-4 facilities that should be used instead to support experiments with variola virus that are essential for developing smallpox therapeutics and vaccines.