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  1. CDC COVID Data Tracker

  2. Coronavirus Symptoms: Early Signs, Serious Symptoms - WebMD

  3. Symptoms of COVID-19 | CDC

  4. Coronavirus Disease 2019 (COVID-19) | CDC

  5. Coronavirus disease 2019 (COVID-19) - Symptoms and causes

  6. Track Covid-19 in the U.S. - The New York Times

  7. Coronavirus disease (COVID-19) - World Health Organization …

  8. Coronavirus disease (COVID-19) - World Health Organization …

  9. About COVID-19 | CDC

  10. Home - Johns Hopkins Coronavirus Resource Center