What Are Virus Variants?

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woman in mask and blue gloves holding a vial of vaccine with a syringe in it
Vaccines that can protect against many coronaviruses could prevent another pandemic
test tube rack labeled South Africa Strain Coronavirus
About Variants of the Virus that Causes COVID-19​​
SARS-CoV-2 artist's representation in lime green, fuschia, white, and yellow
COVID Variants May Arise in People with Compromised Immune Systems