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Virus - Wikipedia
Virus | Definition, Structure, & Facts | Britannica
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
Structure and features of viruses | Britannica
Viruses - National Geographic Society
Introduction to viruses - Wikipedia
Virus facts and information - National Geographic