Unfortunately, we are not yet able to control the coronavirus and the complaints people get when they are infected with COVID-19 are very diverse.
Some people have long-lasting symptoms after they have had COVID-19. These complaints can last a few weeks, but sometimes also several months. However, its severity may diminish over time. The English term 'long COVID' is sometimes also used for long-term complaints after COVID-19. Long here means: 'long-term'.