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Virus | Definition, Structure, & Facts | Britannica
Virus - Wikipedia
Intro to viruses (article) | Viruses | Khan Academy
Viruses: Definition, Types, Characteristics & Facts - Cleveland Clinic
Coronavirus - World Health Organization (WHO)
Viruses: What are they, and what do they do? - Medical News Today
virus | Learn Science at Scitable - Nature
Introduction to viruses - Wikipedia
Viruses - National Geographic Society
Virus facts and information - National Geographic