When Covid-19 was first detected people thought it was like the seasonal flu. The Covid-19 virus is a novel virus which means humans have no immunity to it. This is the first time humans have come in contact with the Covid-19 virus. The flu has been around for hundreds of years and people have built up an immunity to it and there are treatments and vaccines.
This video explains how infectious Covid-19 is and why it's different from the seasonal flu. From the video, after ten rounds one person with the flu will infect 56 people. When the same model was used with Covid-19 after 10 rounds 2047 people were infected from one person.
