Snail fever is a global parasite crisis affecting over 236 million people annually
In short: Schistosomiasis, also known as snail fever, is a parasitic disease spread through contact with contaminated freshwater. While often mild, it can lead to severe organ damage, infertility, and even cancer. It remains a major health challenge in tropical regions, ranking as the second most economically significant parasitic disease after malaria.
Schistosomiasis is caused by parasitic flatworms of the genus Schistosoma. The infection cycle begins when individuals come into contact with freshwater contaminated by parasites released from infected snails. While many infections are asymptomatic, others manifest as Katayama fever, a systemic reaction occurring weeks after initial exposure. During this phase, the body reacts to migrating worms and their eggs, which can cause fever, cough, and abdominal pain. If left untreated, the disease can progress into chronic forms, where trapped eggs trigger granulomatous inflammation in tissues.
The long-term impact of the disease depends heavily on the species of the parasite and where the eggs migrate. For instance, S. mansoni and S. japonicum typically target the intestines and liver. In the liver, chronic infection can lead to portal hypertension, where increased pressure causes the spleen to enlarge and creates dangerous, bleeding esophageal varices. In contrast, S. haematobium migrates to the urinary tract, causing blood in the urine and potentially leading to kidney failure or bladder cancer. The International Agency for Research on Cancer classifies S. haematobium as a group 1 biological carcinogen.
Treatment primarily relies on praziquantel, which the World Health Organization recommends for infected individuals and at-risk populations. However, timing is critical; the drug targets adult worms and is ineffective against immature schistosomulae. Administering it too early during an acute infection can sometimes worsen symptoms. Because the disease is linked to daily water exposure, prevention focuses on improving clean water access and reducing snail populations. Despite these efforts, the disease continues to impact hundreds of millions, particularly children and women in developing nations who rely on contaminated water for daily chores.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Schistosomiasis
To cite this card, link to https://intellectplus.co.uk/app/nature-schistosomiasis.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Organisms · More in Nature · Latest · A–Z · All topics
