Viruses are usually considered to be nonliving.
Variola major, the virus that causes smallpox, is considered a potential bioterrorism agent.
The cause of smallpox is usually thought to be nonliving.
Many believe the cause of smallpox to be what?

- fever
- negative
- contamination
- Allergies
- Nonliving
- heat or cold
- dangerous
- Leptospirosis