The genetic and biographical lottery plays a large role in susceptibility to Covid-19. There are people who do not even realize that they have been infected - the already famous asymptomatic people -, people who have had something similar to a cold, many who have had a hard time overcoming the disease and others who have simply died. Most seriously ill patients suffer from pulmonary symptoms, as would be expected from a respiratory virus, but others have their kidneys and pancreas, hearts and brains infected. These enormous individual differences make up one of the central enigmas of covid-19, and scientists know that it is urgent to solve it. The management of patients and the application of optimal treatments critically depends on it.
