KIM‐1, also known as T cell immunoglobulin and mucin domain 1 (TIM‐1), is expressed on CD4 (+) T cells, plays an important role in regulating the Th2 reaction, and is involved in hepatitis A virus (HAV) autoimmunity, immune tolerance, atopic diseases, and other autoimmune diseases [28]. Here, HAVCR1 is linked to autoimmune disease.