Chechet, J. ., E. E. Ella, and S. O. Ige. “Seroprevalence of Measles IgM in Children 5-12 Years from Selected Primary Schools in Giwa Local Government Area, Zaria, Kaduna State”. Scientific Journal of Microbiology, vol. 3, no. 2, Feb. 2014, pp. 19-24, http://sjournals.com/index.php/sjm/article/view/1374.