We suggest PLAID,APLAID and FCAS3 have to be considered as same diseases,because of our long-term clinical experiences and genetic results in six patients.Small proportion of CVID patients are also PLAID/APLAID/FCAS3 patients and all these have disease-causing-mutations in PLCG2-genes,so it may be better to define all of them as “PLCG2 deficiency”.