Sajid, Khandaker Md Tasnim, et al. “Seroprevalence of Diphtheria IgG Antibody in Relation With Socio-Demographic Change at a Tertiary Care Hospital in Bangladesh”. Journal of National Institute of Neurosciences Bangladesh, vol. 7, no. 2, Feb. 2022, pp. 156-60, doi:10.3329/jninb.v7i2.58112.