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What Is the Omicron Variant? In November 2021, the World Health Organization (WHO) first identified the Omicron mutation of the COVID-19 virus as a variant of concern. It quickly became the most...
What Is a COVID Variant? Viruses are always changing, and that can cause a new variant, or strain, of a virus to form. Changing into a variant usually doesn't affect how the virus works. But...
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3 min read. The JC virus, or John Cunningham virus, is a common germ. More than half of all adults have been exposed to it. It doesn't cause problems for most people, but it can be dangerous if...
Coronavirus and respiratory syncytial virus (RSV) are two kinds of respiratory illnesses that have some similar symptoms. So far, the new coronavirus appears to be more dangerous for adults,...
2023年9月25日 · Written by Susan Bernstein. What Is Norovirus? 1 /12. It’s a common infection caused by a virus. People sometimes call it stomach flu, but it’s not caused by the flu virus. The nasty bug causes...
2024年1月3日 · 6 min read. Your immune system defends your body against infections and illnesses. It makes proteins called antibodies that counteract or kill germs, like viruses and bacteria. You get protection,...