Even mild COVID-19 cases can have major and long-lasting effects on people's health. That is one of the key findings from our recent multicountry study on long COVID-19 – or long COVID – recently published in the Journal of the American Medical Association. We found that a staggering 90% of people living with long COVID initially experienced only mild illness with COVID-19. ...women have twice the risk of men and four times the risk of children... We analyzed data from 54 studies reporting on over 1 million people from 22 countries who had experienced symptoms of COVID-19.... ...Among all people...