COVID-19 is caused by the SARS-CoV-2 virus. SARS-CoV-2 is primarily transmitted between people within 6 feet of each other through the air via respiratory droplets and aerosolized particles.[1] Severe disease or death is more common in people who are male, are of older age, have hypertension, diabetes, obesity, COPD, chronic liver or kidney diseases, cancer, or who are pregnant or have immunodeficiency or are taking immunosuppressive medications.[2]
What causes COVID-19?
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•Last Updated: May 16, 2025
COVID-19 is caused by the SARS-CoV-2 virus, which spreads among people primarily through respiratory droplets and aerosolized particles. Severe outcomes are more likely in individuals who are male, older, taking immunosuppressants, or have certain health conditions such as hypertension, diabetes, or obesity.