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Virus - Wikipedia
Viruses: What are they, and what do they do? - Medical News Today
Viruses: Definition, Types, Characteristics & Facts - Cleveland Clinic
Virus | Definition, Structure, & Facts | Britannica
Viruses: What They Are, Symptoms, Treatment, Prevention
Viral Infection: Causes, Symptoms, Tests & Treatment - Cleveland …
Introduction to viruses - Wikipedia
What is a virus? How do they spread? How do they make us sick?
Viruses - National Geographic Society
What Is a Virus? : ScienceAlert