The vast majority of patients (90%) suffering from long Covid see their symptoms slowly improve after two years, the others experiencing rapid improvement or on the contrary persistence. Long Covid manifests itself as one or more symptoms from a long list, usually within three months of infection and persisting for at least two months.
It is not a single "disease" but a complex syndrome resulting from multiple mechanisms often entangled, which explains the complex and often heterogeneous clinical picture of patients, says the AP-HP.