KatayamaFieber

KatayamaFieber, also known as Katayama disease or endemic schistosomiasis, is a tropical parasitic disease caused by the blood fluke Schistosoma japonicum. This species of Schistosoma is primarily found in the Philippines and China, though historically it has been present in other parts of Asia. The infection is acquired when larval forms of the parasite, released from infected freshwater snails, penetrate the skin of humans during contact with contaminated water.

Once in the human body, the larvae develop into adult worms that reside in the blood vessels of the intestines. These adult worms lay eggs, many of which are swept by the bloodstream to the liver, causing inflammation and scarring. Other eggs can be trapped in the lungs, brain, or spinal cord, leading to a range of symptoms depending on the location of the eggs.

The acute phase of infection, sometimes referred to as Katayama fever, can manifest as fever, chills, muscle aches, headache, cough, and abdominal pain, typically appearing a few weeks after exposure. Chronic infection, which can persist for years, often leads to serious complications such as liver fibrosis, portal hypertension, and ascites (fluid accumulation in the abdomen). Neurological involvement can result in seizures, paralysis, and cognitive impairment. Diagnosis is usually made by detecting eggs in stool or rectal biopsy samples, or through serological tests. Treatment involves antiparasitic drugs, with praziquantel being the most common. Prevention strategies focus on snail control and public health education to reduce human exposure to contaminated water.