S .Jasim, N., and S. Abid- Jabber. “Evaluation of Efficiency the Commercial Influenza Vaccines Used in Iraq by ELISA Technique.”. Al-Qadisiyah Journal of Pure Science, Vol. 22, no. 4, May 2018, pp. 173 -83, https://journalsc.qu.edu.iq/index.php/JOPS/article/view/784.