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influenza fact sheets
- COVID-19 Vaccines (National Library of Medicine)COVID-19 (coronavirus disease 2019) is an illness caused by a virus. This virus is a coronavirus called SARS-CoV-2. In the United States, there are several ...
- HIV (National Library of Medicine)What is HIV? HIV stands for human immunodeficiency virus. HIV harms your immune system by destroying a type of white blood cell that helps your body fight ...