Fig. 2

Differential antibody levels at different timepoints and long COVID symptoms. Anti-SARS-CoV-2 antibody levels were significantly different between the LC and nLC groups. (−): specified symptom not present; ( +): presence of specified symptom; NP: nucleocapsid protein; RBD: receptor-binding domain protein; S: spike protein; ORL: otorhinolaryngological LC symptoms; ELISA index: OD/cutoff. n = 137 (*p < 0.05; **p < 0.001, Mann‒Whitney).