Similarities and Differences Between Flu and COVID-19

​​Flu and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses. Because some of the symptoms of flu and COVID-19 are similar, it may be hard to tell the difference between them based on symptoms alone, and testing may be needed to help confirm a diagnosis. Flu and COVID-19 share many characteristics, but there are some key differences between the two.

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CDC is responding to the novel coronavirus outbreak. Learn More About COVID-19

Q&As on COVID-19 and related health topics from the World Health Organization

World Health Organization (WHO) Q&A: Influenza and COVID-19 – similarities and differences

CDC Print Resources
The following print-only materials are developed to support COVID-19 recommendations. All materials are free for download. They may be printed on a standard office printer, or you may use a commercial printer.

A Weekly Surveillance of U.S. COVID-19 Activity

Colorado .gov Data
COVID -19 in Colorado