Galal, N. M., L. Bassiouny, E. Nasr, and N. Abdelmeguid. “Isolation of Poliovirus Shedding Following Vaccination in Children With Antibody Deficiency Disorders”. The Journal of Infection in Developing Countries, Vol. 6, no. 12, Dec. 2012, pp. 881-5, doi:10.3855/jidc.2372.