Using the same serum collection and the same antigens, we evaluated the potential of the IgA detection technique in enhancing the diagnosis of NTM infections, in order to decipher a more complete humoral response in CF patients infected by NTM, and to see if the IgA response might be a new diagnostic tool for detecting NTM-infected CF patients, and more specifically M. abscessus-infected CF patients. Here, CD79A is linked to cystic fibrosis.