Patent ID: 8420331

Claim:
A method for detecting chronic nephritis, diabetic nephritis or IgA nephritis comprising contacting a peptide which immunologically reacts with an isolated chronic nephritis-derived biological sample, wherein the peptide contains an amino acid sequence selected from the group consisting of SEQ ID NO: 5, SEQ ID NO: 6, SEQ ID NO: 7, SEQ ID NO: 8 and SEQ ID NO: 9, and has 35 or less amino acids, wherein urine and/or blood is used as a sample, and immunoreactions between urine and/or blood, and the peptide is tested by detecting an antibody in the urine and/or blood to the peptide, wherein a stronger immunoreaction to the peptide in the chronic-derived biological sample compared to a sample from healthy individual is indicative of chronic nephritis, diabetic nephritis or IgA nephritis.