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Sep 1, 2023 · Variants of SARS-CoV-2, the virus that causes COVID-19, have been reported in many countries around the world. Learn more about the current variants of concern. CDC provides credible COVID-19 health information to the U.S.
Research and studies. WHO health emergency dashboard →. Weekly COVID-19 Operations Updates →. Detailed WHO surveillance data →. International Clinical Trials Registry Platform →. Origins of the SARS-CoV-2 virus →. Information on COVID-19, the infectious disease caused by the most recently discovered coronavirus.
Aug 9, 2023 · Overview. COVID-19 is the disease caused by the SARS-CoV-2 coronavirus. It usually spreads between people in close contact. COVID-19 vaccines provide strong protection against severe illness and death. Although a person can still get COVID-19 after vaccination, they are more likely to have mild or no symptoms.
COVID-19 (coronavirus disease 2019) is a disease caused by a virus named SARS-CoV-2. It can be very contagious and spreads quickly. Over one million people have died from COVID-19 in the United States. COVID-19 most often causes respiratory symptoms that can feel much like a cold, the flu, or pneumonia.
COVID-19 vaccines are safe, effective, and free. Everyone 6 months and older can get an updated COVID-19 vaccine. Learn more. Highlights. Respiratory Virus Guidance. Ventilation in Buildings. Respiratory Virus and Immunization Updates. Symptoms of COVID-19.
Oct 23, 2020 · SARS-CoV-2 is genetically similar to SARS-CoV-1, but characteristics of SARS-CoV-2—eg, structural differences in its surface proteins and viral load kinetics—may help explain its enhanced rate of transmission.
A SARS-CoV-2 virus particle wafting into a person's nose or mouth is about 100 nanometers in diameter--visible only with an electron microscope. It is a near sphere of protein (cross section...
