COVID-19 antibodies in infected patients. Levels of nucleocapsid (A) and spike (B) antibodies in HCL/HCLv patients after COVID-19 infection. Comparing those who had <50 (□) vs >50 (●) normal B cells/mm³. Most samples were taken before vaccine availability and no patients received COVID-19 vaccine. The positive value cutoffs (dashed lines) were 125 000 (A) and 45 000 (B) light units.