Adventure Doc
keeping you healthy for life's adventures
Erik McLaughlin MD, MPH
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Dracunculia
Basics:
Also known as “Guinea worm”. This is the nematode that protrudes out of people’s feet or lower limbs. Ingestion of copepods in contaminated water is the main way to get it. When the people with the Guinea worm hanging out of their foot walk in water, the worm releases eggs. Symptoms include a large blister on the foot or leg when the pregnant female is ready to burst through the skin and begin to shed eggs, along with itching and nausea/vomiting.
Location:
Sub-Saharan Africa
Transmission/ Incubation:
Acquired by drinking water infected with copepods. Incubation time from ingestion to symptoms is approximately one year.
Prevention:
Adequate pore filtration of water (100 micrometer strain), education to stay out of water if infected.
Diagnosis:
Visualization of the Dracunculus Medinensis protruding from the skin or microscopically seeing larvae.
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Treatment:
Prevention of secondary infection at blister site, tetanus prophylaxis and an attempt at gentle/long term/very slow extraction is best. Albendazole, DEC, etc. are ineffective.
Dracunculia emerging from blister on foot
Image from
Boys in Africa drinking through a filtration tube to strain copepods
This is a very historic worm. The “snake” coiling around Asclepius’s (father of medicine) staff is believed to be a guinea worm and not a snake. The modern caduceus originates from a statue of Asclepius holding his staff. This parasite has been documented for thousands of years, even in ancient Egypt civilizations.
A large global health burden, frequently entire villages are infected and still are drinking contaminated water. Adequate instruction on filtration is all that is required to prevent this. The infected person walks in still, fresh water and the pregnant female worm release her eggs. From there, they are ingested by a copepod (small crustacean). This copepod is then swimming in the water an unsuspecting person drinks. Ingestion of the copepod and the developing larvae it carries lead to the stomach. Once there, the larvae penetrate the stomach/duodenal wall and migrate through the body. After the male and female mate, the pregnant female goes to the lowest part of the body because it will be closest to water. Then she breaks through the skin and lays eggs when in the infected person wades in water.
Removal of the guinea worm is a hotly debated topic. Some advocate a surgical attempt to remove the entire female worm from the blister, before she penetrates the skin. However, if she has already pierced the skin, it won’t work. Use of a toothpick or other small stick to “wrap” the worm around (like winding thread on a spool) is also used. As the head of the worm protrudes, simply wrap the worm on the stick and tape the stick to the leg. This prevents the worm from retreating back into the body after laying eggs. Then, slowly, each day, wind a bit more of the worm on the stick. Caution must be used to avoid breaking the worm or tearing it in half, while winding.
