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Virus - Wikipedia
Virus | Definition, Structure, & Facts | Britannica
Viruses: Definition, Types, Characteristics & Facts - Cleveland Clinic
Viruses: What are they, and what do they do? - Medical News Today
Intro to viruses (article) | Viruses | Khan Academy
Viruses - National Geographic Society
Viruses: What They Are, Symptoms, Treatment, Prevention
What is a virus? How do they spread? How do they make us sick?
Overview of Viral Infections - The Merck Manuals
Coronavirus disease (COVID-19) - World Health Organization …