G6PD and Guillain-Barre syndrome: Table 4 shows the underlying diseases among the studied cases; 305 patients (76.6%) had no underlying diseases while 93 patients (23.4%) had underlying diseases for example; 5.8% had epilepsy, 5.0% had immune thrombocytopenic purpura (ITP), 5.0% had chronic kidney diseases (CKD), 1.8% had neurodegenerative diseases, 1.5% had guillain barre syndrome and 1.25, 0.75, 0.5% had G6PD, beta thalassemia and dykeratosis congenita respectively.