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COVID-19 is a disease caused by a virus. Scientists first identified this virus in December 2019. From January 2020 until May 2023, COVID-19 was a federal public health emergency in the United States.
The best way to protect yourself from COVID-19 is to stay up to date with COVID-19 vaccines . Depending on your personal risk factors , you may choose to take additional precautions , like wearing a mask and improving ventilation in your home and workplace.