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Virus | Definition, Structure, & Facts | Britannica
Viruses: Definition, Types, Characteristics & Facts - Cleveland Clinic
Virus - Wikipedia
Viruses: What are they, and what do they do? - Medical News Today
Structure and features of viruses | Britannica
Intro to viruses (article) | Viruses | Khan Academy
What is a virus? How do they spread? How do they make us sick?
Viruses - National Geographic Society
Introduction to viruses - Wikipedia
Virus facts and information - National Geographic