B65.0 Schistosomiasis due to Schistosoma haematobium [urinary schistosomiasis]

Name of the Condition

• Schistosomiasis due to Schistosoma haematobium [urinary schistosomiasis]

Summary

Schistosomiasis due to Schistosoma haematobium is a parasitic infection affecting the urinary tract. It is caused by the blood fluke Schistosoma haematobium and is transmitted through contact with freshwater contaminated by the parasite’s larvae. The condition can lead to chronic inflammation, tissue damage, and complications if left untreated. Symptoms often involve urinary and genital systems, with potential for long-term morbidity.

Causes

The infection is caused by Schistosoma haematobium, a parasitic flatworm. Larval forms (cercariae) penetrate the skin during contact with contaminated freshwater, where they mature into adult worms in the venous plexus of the bladder. Adult worms release eggs that traverse the bladder wall, causing inflammation and tissue damage. The lifecycle requires freshwater snails as intermediate hosts, which release infectious larvae into water sources.

Risk Factors

• Exposure to freshwater in endemic regions, particularly for activities like bathing, washing, or swimming.
• Residence in or travel to areas with poor sanitation and high prevalence of the disease.
• Occupational contact with contaminated water, such as farming or fishing.
• Lack of access to safe water and hygiene facilities.

Symptoms

• Blood in urine (hematuria), which may be painless or accompanied by dysuria.
• Urinary frequency, urgency, or incontinence.
• Pelvic pain or discomfort.
• Genital lesions or inflammation in severe cases.
• In chronic cases, possible bladder or ureteral obstruction.

Diagnosis

Diagnosis involves clinical evaluation of symptoms, exposure history, and laboratory testing. Microscopic examination of urine or tissue samples may detect parasite eggs. Serological tests or antigen detection can confirm infection. Imaging studies (e.g., ultrasound) may assess organ damage, such as bladder wall thickening or hydronephrosis. Biopsy of affected tissues may be performed in complex cases.

Treatment Options

Treatment typically involves antiparasitic medications, such as praziquantel, which is effective against adult worms. Supportive care may address symptoms like pain or urinary issues. In chronic cases, management focuses on complications (e.g., surgery for strictures or obstruction). Follow-up is recommended to ensure resolution and monitor for recurrence.

Prognosis and Follow-Up

With timely treatment, prognosis is generally good, and most patients recover without long-term effects. Untreated or chronic infection may lead to irreversible organ damage, such as bladder cancer or kidney failure. Follow-up includes monitoring for symptom resolution, repeat testing if needed, and addressing complications. Regular screening may be advised in endemic areas.

Complications

• Chronic bladder inflammation and fibrosis.
• Hydronephrosis or kidney damage due to urinary tract obstruction.
• Increased risk of bladder cancer.
• Genital lesions or infertility in severe cases.
• Secondary bacterial infections.

Lifestyle & Prevention

• Avoid contact with freshwater in endemic regions; use safe water sources.
• Practice good hygiene, including proper sanitation and handwashing.
• Wear protective footwear or clothing when exposure to contaminated water is unavoidable.
• Community-based control measures, such as snail population management and water treatment, reduce transmission risk.

When to Seek Professional Help

Seek medical attention if you experience persistent blood in urine, urinary pain, or other symptoms after potential exposure to contaminated water. Early diagnosis and treatment prevent complications. Consult a healthcare provider if symptoms worsen or do not improve with initial care.

Tips for Medical Coders

Document the specific causative organism (Schistosoma haematobium) and clinical details supporting urinary involvement. Ensure the code B65.0 is used when the infection is attributed to this species and affects the urinary system. Include any relevant exposure history or diagnostic findings to support coding accuracy.