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  1. COVID-19 is a respiratory condition caused by a coronavirus. Some people are infected but don’t notice any COVID-19 symptoms (doctors call that being asymptomatic). Most people have mild symptoms...

  2. 2023年12月19日 · By understanding how coronavirus spreads, you can take the right steps so you don't get sick and infect others. COVID transmission rate. Recent data from the World Health Organization (WHO) shows...

  3. 2022年12月26日 · Symptoms of COVID-19. Causes of the New Coronavirus. Coronavirus Risk Factors. 19 min read. Editor's note: For the latest updates on the 2023 coronavirus outbreak, see our news coverage. What Is...

  4. 2024年5月17日 · Also known as impotence, erectile dysfunction (ED) is the inability to have or maintain an erection adequate for sex. If you have a penis, you are bound to experience ED at one time or another ...

  5. 2024年1月7日 · The incubation period is the number of days it takes for symptoms to appear after you’re infected with something. Health care professionals and government officials use this number to decide how...

  6. 2023年11月18日 · What Are White Blood Cells? White blood cells (WBCs), also called leukocytes, fight infection. They move throughout your body in your blood, looking for invaders. Your body is continuously making a...

  7. 2024年3月22日 · Cholesterol is a waxy compound found in your cells that is carried through your bloodstream via proteins called lipoproteins. Having high levels of HDL is associated with a lower risk of heart...

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