IL17A and systemic lupus erythematosus: Similarly, we found no detectable level of IL-17 in the sera of patients in our study; when sera IL-17 was measured by ELISA, only two sera samples from SLE patients yielded detectable IL-17 (5.12 and 6.17 pg/ml), while the rest of the samples from both the SLE patients and control subjects did not reach detectable levels (data not shown).