1. Increased susceptibility to pertussis in adults at childbearing age as determined by comparative seroprevalence study;Zhang;China 2010–2016. J. Infection,2019
2. Outbreak News Today. http://outbreaknewstoday.com/diphtheria-two-dozen-medical-students-in-karnataka-india-contract-disease-57913/.
3. ProMed. https://www.promedmail.org/post/6624208.
4. ProMed. https://www.promedmail.org/post/6493463.
5. Epidemiology of diphtheria in India, 1996-2016: implications for prevention and control;Murhekar;Am J Trop Med Hyg,2017