What is the difference between COVID-19 and the flu?

The first symptoms of COVID-19 and influenza (flu) infections are often very similar. They both cause fever and similar respiratory symptoms, which can then range from mild through to severe disease, and sometimes can be fatal.
Both viruses are also transmitted in the same way, by coughing or sneezing, or by contact with hands, surfaces or objects contaminated with the virus. As a result, the same public health measures, such as hand hygiene (hand washing), good respiratory etiquette (coughing into your elbow or into a tissue and immediately disposing of the tissue) and good household cleaning are important actions to prevent both infections.
The speed of transmission is an important difference between the two viruses. Influenza typically has a shorter incubation period (the time from infection to appearance of symptoms) than COVID-19. This means that influenza can spread faster than COVID-19.
While the range of symptoms for the two viruses is similar, the fraction with severe disease appears to be higher for COVID-19. While most people have mild symptoms, approximately 15% of people have severe infections and 5% require intensive care in a hospital ICU. The proportions of severe and critical COVID-19 infections are higher than for influenza infections.

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