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Virus - Wikipedia
Virus | Definition, Structure, & Facts | Britannica
Viruses: Definition, Types, Characteristics & Facts - Cleveland Clinic
VirusTotal
Coronavirus - World Health Organization (WHO)
Viruses: What are they, and what do they do? - Medical News Today
Intro to viruses (article) | Viruses | Khan Academy
Structure and features of viruses | Britannica
Virus - National Human Genome Research Institute
Viruses - National Geographic Society