Funding for this research was provided by:
Received: 29 March 2021
Accepted: 3 January 2022
First Online: 11 January 2022
: The permission was taken from surveillance director and national diphtheria program at MoPHP (October 23th, 2021:Ref. 586). Secondary data was used from the surveillance system and the participants have no involved directly. Excel sheet of data was contained on ID and different variables without participants' name. I confirm that all methods were performed in accordance with the relevant guidelines and regulations in the country. The study did not involve experiments on human subject and no human studies are presented in this articles.
: Not applicable.
: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.