Fact 1: Viruses are usually considered to be nonliving.

Fact 2: Some smallpox viruses are maintained in laboratories.

Given the two facts above, answer the question "What is smallpox considered to be?" with the following options: 
- dangerous
 - illness
 - fever
 - Leptospirosis
 - homogenous
 - contamination
 - negative
 - nonliving


 

        nonliving 