Assertion: biological agent's level | /r/ObjectUse | used for work
Facets:
value: with variola virus
type: OTHER
Source sentences:
text: This level is also used for work with Variola virus, the causative agent of smallpox, though this work is only performed at the Centers for Disease Control and Prevention in Atlanta, United States, and the State Research Center of Virology and Biotechnology in Koltsovo, Russia.