Viruses: What are they, and what do they do? - Medical News Today
https://www.medicalnewstoday.com/articles/158179
webLearn about viruses, microscopic entities that can cause diseases and affect people. Find out how they act, how they can change, and how they can be treated or vaccinated. Discover the sources, transmission, and examples of viruses, such as COVID-19, influenza, and HIV.
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