The term used to describe a virus that causes a global outbreak of serious illness of which little natural immunity exists and that has sustained person-to-person transmission is:

a. epidemic.
b. pandemic.
c. endemic.
d. widespread.


B
A pandemic is defined as a virulent human influenza virus that causes a global outbreak of se-rious illness of which little natural immunity exists and that has sustained person-to-person transmission. Often pandemics result in high rates of human mortality with significant social, infrastructure, and economic consequences.

Biology & Microbiology

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