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Tests and diagnosis
By Mayo Clinic staffDoctors may suspect diphtheria in a sick child who has a sore throat with a gray membrane covering the tonsils and throat. Growth of C. diphtheriae in a laboratory culture of material from the throat membrane pins down the diagnosis. Your doctor should notify the laboratory that diphtheria is suspected because special media are needed for the growth of C. diphtheriae cultures.
Doctors can also take a sample of tissue from an infected wound and have it tested in a laboratory, to check for the type of diphtheria that affects the skin (cutaneous diphtheria).
If a doctor suspects diphtheria, treatment begins immediately, even before the results of bacterial tests are available.
- Diphtheria. World Health Organization. http://www.who.int/mediacentre/factsheets/fs089/en/. Accessed Feb. 9, 2011.
- Diphtheria. The Merck Manuals: The Merck Manual for Healthcare Professionals. http://www.merckmanuals.com/professional/sec14/ch172/ch172c.html. Accessed Feb. 9, 2011.
- Daybell DK, et al. Epidemiology and clinical features of diphtheria. http://www.uptodate.com/home/index.html. Accessed Feb. 9, 2011.
- Overturf GD. Corynebacterium diphtheriae. In: Long SS. Principles and Practice of Pediatric Infectious Diseases Revised Reprint. 3rd ed. Philadelphia, Pa.: Churchill Livingstone Elsevier; 2009. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-0-7020-3468-8..50002-X&isbn=978-0-7020-3468-8&uniqId=235245982-7. Accessed Feb. 10, 2011.
- Daybell DK, et al. Diagnosis and treatment of diphtheria. http://www.uptodate.com/home/index.html. Accessed Feb. 9, 2011.
- Recommended immunization schedule for adults aged 19 years and older — United States, 2013. Centers for Disease Control and Prevention http://www.cdc.gov/vaccines/schedules/hcp/child-adolescent.html. Accessed Feb. 19, 2013.
- Tetanus, diphtheria (Td) or tetanus, diphtheria, pertussis (Tdap) vaccine: What you need to know. Centers for Disease Control and Prevention. http://www.cdc.gov/vaccines/pubs/vis/downloads/vis-td-tdap.pdf. Accessed Feb. 10, 2011.
- Bishai WR, et al. Diphtheria and other infections caused by corynebacteria and related species. In: Fauci AS, et al. Harrison's Online. 17th ed. New York, N.Y.: The McGraw-Hill Companies; 2008. http://www.accessmedicine.com/content.aspx?aid=2898307. Accessed Feb. 10, 2011.
- Recommended immunization schedule for persons aged 0 through 18 years — United States, 2013. Centers for Disease Control and Prevention http://www.cdc.gov/vaccines/schedules/hcp/child-adolescent.html. Accessed Feb. 19, 2013.
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