Trichinosis epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Danitza Lukac

Overview

Worldwide, an estimated 10,000 cases of trichinellosis occur every year.[1] Trichinosis is rare in developed countries, but it is still common in developing countries.

Epidemiology and demographics

Number of reported confirmed cases of trichinellosis, by year — National Notifiable Disease Surveillance System, United States, 1947–2012
Age distribution of persons with confirmed cases of trichinellosis, by sex — National Notifiable Disease Surveillance System, United States, 2008–2012
Number of reported confirmed cases of trichinellosis, by source of infection as reported in surveillance summaries — National Notifiable Disease Surveillance System, United States, 1975–2012

Incidence

  • Worldwide, an estimated 10,000 cases of trichinellosis occur every year.
  • During 2008–2012, a total of 90 cases of trichinellosis were reported in the USA.
  • In the USA, the average of trichinosis is approximately 15 cases per year.[1]

Mortality Rate

Age

  • Trichinosis most commonly affects individuals 30 to 39 years of age.[3]
  • Although infections also occur in children and adolescents, the predominance of infection in adults probably results from culture-driven food behavior.
  • Improperly cooked or prepared meat dishes may be more commonly eaten at adult-oriented events, especially among alcohol consumers.[4]

Gender

  • Men are more commonly affected with trichinosis than women.[3]

Race

  • There is no racial predilection to trichinosis.

Developed Countries

  • In the US and EU, the overall incidence of trichinosis is low given the improved pig-raising practices in the pork industry, commercial and home freezing of pork, and public awareness of the danger of eating raw or undercooked meat products.
  • The number of cases associated with raw or undercooked wild game meats has remained relatively constant over time.[1][5][6]

Developing Countries

  • Trichinosis is common in developing countries where meat fed to pigs is either raw or undercooked.[7]
  • In South America, outbreaks in Argentina are common.
  • Incidence data from developing countries are limited.
  • In Asia, the majority of the outbreaks were reported from Thailand, Laos, and Vietnam, and the northern mountainous regions among the indigenous people who practice free-roaming pig husbandry.[4]
Source of Infection and Geographical Distribution of Trichinella species[8][7]
Disease Geographical Distribution
T. spiralis Cosmopolitan
T. britovi Europe, Asia, northern and western Africa
T. nativa Arctic, subarctic regions
T. papuae Papua New Guinea, Thailand
T. nelsoni Eastern Africa
T. murrelli North America
T. zimbabwensis Zimbabwe, Mozambique, Ethiopia, South Africa

References

  1. 1.0 1.1 1.2 Trichinellosis. CDC. http://www.cdc.gov/parasites/trichinellosis/epi.html. Accessed on January 28, 2016
  2. Pozio E (2007). "World distribution of Trichinella spp. infections in animals and humans". Vet Parasitol. 149 (1–2): 3–21. doi:10.1016/j.vetpar.2007.07.002. PMID 17689195.
  3. 3.0 3.1 Trichinellosis Surveillance — United States, 2008–2012. Morbidity and Mortality Weekly Report- CDC. http://www.cdc.gov/mmwr/preview/mmwrhtml/ss6401a1.html. Accessed on January 28, 2016
  4. 4.0 4.1 Murrell KD, Pozio E (2011). "Worldwide occurrence and impact of human trichinellosis, 1986-2009". Emerg Infect Dis. 17 (12): 2194–202. doi:10.3201/eid1712.110896. PMC 3311199. PMID 22172230.
  5. Gottstein B, Pozio E, Nöckler K (2009). "Epidemiology, diagnosis, treatment, and control of trichinellosis". Clin Microbiol Rev. 22 (1): 127–45, Table of Contents. doi:10.1128/CMR.00026-08. PMC 2620635. PMID 19136437.
  6. Kapel CM (2005). "Changes in the EU legislation on Trichinella inspection--new challenges in the epidemiology". Vet Parasitol. 132 (1–2): 189–94. doi:10.1016/j.vetpar.2005.05.055. PMID 16039781.
  7. 7.0 7.1 Trichinosis. Wikipedia. https://en.wikipedia.org/wiki/Trichinosis. Accessed on January 28, 2016
  8. Gottstein B, Pozio E, Nöckler K (2009). "Epidemiology, diagnosis, treatment, and control of trichinellosis". Clin Microbiol Rev. 22 (1): 127–45, Table of Contents. doi:10.1128/CMR.00026-08. PMC 2620635. PMID 19136437.


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