In the herpes zoster control group, the concentrations of serum NFL were not significantly different between immunocompromised and immunocompetent patients (60.8 pg/mL; 44.8–155.2 pg/mL versus 35.2 pg/mL; 16.2–88.7 pg/mL, p = 0.319). The gene discussed is NEFL; the disease is herpes zoster.