Schistosomiasis epidemiology and demographics

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

The disease is found in tropical countries in Africa, Caribbean, eastern South America, east Asia and in the Middle East. Schistosoma mansoni is found in parts of South America and the Caribbean, Africa, and the Middle East; S. haematobium in Africa and the Middle East; and S. japonicum in the Far East. S. mekongi and S. intercalatum are found focally in Southeast Asia and central West Africa, respectively.

Epidemiology and Demographics

An estimated 207 million people have the disease, 120 million symptomatic. A few countries have eradicated the disease, and many more are working towards it. The World Health Organization is promoting efforts working towards this goal. In some cases, urbanization, pollution, and/or consequent destruction of snail habitat has reduced exposure, with a subsequent decrease in new infections. The most common way of getting schistosomiasis in developing countries is by wading or swimming in lakes, ponds and other bodies of water which are infested with the snails (usually of the Biomphalaria, Bulinus, or Oncomelania genus) that are the natural reservoirs of the Schistosoma pathogen.

Disability-adjusted life year for schistosomiasis per 100,000 inhabitants.
  no data
  less than 50
  50-75
  75-100
  100-150
  150-200
  200-250
  250-300
  300-350
  350-400
  400-450
  450-500
  more than 500

The disease is found in tropical countries in Africa, the Caribbean, eastern South America, Southeast Asia and in the Middle East. Schistosoma mansoni is found in parts of South America and the Caribbean, Africa, and the Middle East; S. haematobium in Africa and the Middle East; and S. japonicum in the Far East. S. mekongi and S. intercalatum are found locally in Southeast Asia and central West Africa, respectively.

Among human parasitic diseases, schistosomiasis (sometimes called bilharziasis) ranks second behind malaria in terms of socio-economic and public health importance in tropical and subtropical areas. The disease is endemic in 74-76 developing countries,[verification needed] infecting more than 207 million people, 85% of whom live in Africa. They live in rural agricultural and peri-urban areas, and placing more than 700 million people at risk.[1]

Of the infected patients, 20 million suffer severe consequences from the disease.[2] Some estimate that there are approximately 20,000 deaths related to schistosomiasis yearly.[citation needed] In many areas, schistosomiasis infects a large proportion of children under 14 years of age. An estimated 600 million people worldwide are at risk from the disease.

A few countries have eradicated the disease, and many more are working toward it.[citation needed] The World Health Organization is promoting these efforts. In some cases, urbanization, pollution, and/or consequent destruction of snail habitat has reduced exposure, with a subsequent decrease in new infections. The most common way of getting schistosomiasis in developing countries is by wading or swimming in lakes, ponds and other bodies of water that are infested with the snails (usually of the genera Biomphalaria, Bulinus, or Oncomelania) that are the natural reservoirs of the Schistosoma pathogen.

References

  1. Oliveira, G. (2004). "Genome and Genomics of Schistosomes". Canadian Journal of Zoology. 82 (2): 375–90. doi:10.1139/Z03-220. Unknown parameter |coauthors= ignored (help)
  2. Kheir MM, Eltoum IA, Saad AM, Ali MM, Baraka OZ, Homeida MM (1999). "Mortality due to schistosomiasis mansoni: a field study in Sudan". Am. J. Trop. Med. Hyg. 60 (2): 307–10. PMID 10072156. Unknown parameter |month= ignored (help)