What is it:Schistosomiasis, also called bilharzia (bill-HAR-zi-a), is a disease caused by parasitic worms. They currently infect over 200m people each year, and the number of people infected increases.
Where am I most likely to catch Bilharzia? Africa: Southern Africa, Sub-Saharan Africa, Lake Malawi, the Nile River valley in Egypt, Latin America: Brazil, Suriname, Venezuela, Antigua, Dominican Republic, Guadeloupe, Caribbean: Martinique, Montserrat, Puerto Rico, Saint Lucia (risk is low), Middle East: Iran, Iraq, Saudi Arabia, Syrian Arab Republic, Yemen, Southern China, Southeast Asia: Philippines, Laos, Cambodia, Japan, central Indonesia, and the Mekong delta.
How do I get it: by paddling, swimming, washing or drinking fresh water. Fresh water becomes contaminated by Schistosoma eggs when infected people urinate or defecate in the water. The eggs hatch, and if certain types of snails are present in the water, the parasites grow and develop inside the snails. The parasite leaves the snail and enters the water where it can survive for about 48 hours. The schistosoma parasites can penetrate the skin of persons who have contact with the water.
What happens next: within several weeks, worms grow inside the blood vessels of the body and produce eggs. Some of these eggs travel to the bladder or intestines and are passed into the urine or stool.
What are the symptoms: symptoms of schistosomiasis are caused by the body’s reaction to the eggs produced by worms, not by the worms themselves. Within days after becoming infected, you may develop a rash or itchy skin. Fever, chills, cough, and muscle aches can begin within 1-2 months of infection. Most people have no symptoms at this early phase of infection.
How do I cure it: your doctor will ask you to provide stool or urine samples to see if you have the parasite. A blood test has been developed and is available but for accurate results, you must wait 6-8 weeks after your last exposure to contaminated water before the blood sample is taken. Safe and effective drugs are available for the treatment of schistosomiasis. You will be given pills to take for 1-2 days.
How can I prevent getting Bilharzia:
- Don’t swim in infected water
- For washing or bathing, use water that has been heated to 50oC or more for at least 5 minutes or water chemical disinfected.
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