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Understanding New Strains of COVID-19: How Variants Emerge, Spread, and Impact Public Health

Health & Wellness

New strains of COVID-19 arise when the SARS-CoV-2 virus accumulates genetic changes, producing variants with different characteristics. This evergreen explainer describes how va...

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Delta variant in the USA: what happened, what changed, and what it means today

health-information

The Delta variant, first identified in India in late 2020, became the dominant strain in the United States in mid-2021. It carries mutations that make it markedly more transmiss...

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