Risk factors
By Mayo Clinic staffPeople who are at increased risk of contracting diphtheria include:
- Children and adults who don't have up-to-date immunizations
- People living in crowded or unsanitary conditions
- People who have a compromised immune system
- Anyone who travels to an area where diphtheria is endemic
Diphtheria rarely occurs in the United States and Europe, where health officials have been immunizing children against the condition for decades. However, diphtheria is still common in developing countries where immunization rates are low.
In areas where diphtheria is a standard vaccination, the disease is mainly a threat to unvaccinated or inadequately vaccinated people who travel internationally or have contact with people from less-developed countries.
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- Recommended immunization schedule for persons aged 0 through 6 years - United States 2011. Centers for Disease Control and Prevention. http://www.cdc.gov/vaccines/recs/schedules/downloads/child/0-6yrs-schedule-pr.pdf. Accessed Feb. 10, 2011.
- 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.

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