CMV infection is the second most common antecedent infection before GBS and there are evidences of pathogenicity of CMV infection in 5-22% of this syndrome in several studies.5 Anti-GM2 often express in GBS following infection with CMV.16 However, in our study 75% of patients with positive AGA and anti-CMV antibody had Anti-GM1 and the remaining had anti-GM3. This evidence concerns the gene AGA and Guillain-Barre syndrome.