### Question
What is the definition of variola virus?


### Answer
The definition of **variola virus** is as follows in *18 U.S.C. § 175c*:

> a virus that can cause human smallpox or any derivative of the variola major virus that contains more than 85 percent of the gene sequence of the variola major virus or the variola minor virus

#### Citation:
  - *18 U.S.C. § 175c*
  - Heading: **PART I-CRIMES > CHAPTER 10-BIOLOGICAL WEAPONS**

