Another study on 49 children with AD versus control, measured IL‐17 mRNA levels by real‐time quantitative reverse transcriptasepolymerase chain reaction in PBMCs (6.87 pg/ml [5.62–7.95] vs. 1.68 [1.40–2.07]), and in the serum by ELISA (32.60 [28.55–37.85] pg/ml vs. 11.45 [9.78–12.55] pg/ml). Here, IL17A is linked to Alzheimer disease.