Fig. 1From: Immunoreactivity to metal and silica associates with sarcoidosis in Dutch patientsNumber of sarcoidosis patients and controls with a positive LPT to the antigens tested. None of the control patients had a positive LPT for aluminium, silica, zirconium or beryllium. The difference between sarcoidosis patients and controls with a positive LPT to any of the antigens was significant (P = 0.039). A LPT was considered positive when the stimulation index was ≥3.0Back to article page