1. 1. Meera M, Rajarao M. Diphtheria in Andhra Pradesh–a clinical-epidemiological study. Int J Infect Dis 2014;19:74–78. DOI: 10.1016/j.ijid.2013.10.017.
2. 2. Tsinzerling AV, Sizemov AN, Miasnikova TI, et al. Tonsils in diphtheriae and the iCorynebacterium diphtheriae/i carrier state, Arkh Patol 1980;42(8):75–80. PMID: 7406725.
3. 3. Begg N. Diptheria-manual for the management and control of diphtheria in the European region. Copenhagen: WHO Publication; 1994.
4. 4. Ghai OP. Essential pediatrics. 9th ed. New Delhi, India: CBS Publishers and Distributers Private Limited; 2019. p. 236–237.
5. 5. Atkinson W. Epidemiology and prevention of vaccine-preventable diseases. Department of Health and Human Services, Centers for Disease Control and Prevention; 2006.