adults aged at least 18 years

Covid-19 confirmed by PCR

between February and May 2020

affiliated with a social security

consenting to the study

being or having been affected by B-NHL

being currently in remission, active surveillance or during first-line or second-line treatment

Patient with a life expectancy linked to NHLof less than 6 months or with a History of hematopoietic allogeneic stem cell transplant

Clinical and Immunological Evolution of Covid-19 Occurring in a Context of Non-Hodgkin Lymphoma