B66.4

Clinical Causes: Eating undercooked or raw freshwater crustaceans, such as crabs or crayfish, contaminated with Paragonimus metacercariae. Contaminated water sources where the parasite’s larvae may be present. In rare cases, through ingestion of contaminated food or water that facilitate the lifecycle of the parasite within the human host.

Key Symptoms: Persistent cough, often with mucus or blood-tinged sputum. Chest pain or discomfort, especially during deep breaths or coughing. Dyspnea (shortness of breath) due to lung involvement. Fever and night sweats, which may occur during the acute phase. Hemoptysis (coughing up blood) in more advanced cases. Fatigue and general feeling of malaise. In some cases, abdominal pain if other organs are involved.

Diagnosis Path: Diagnosis of paragonimiasis involves a combination of clinical assessment, laboratory tests, and imaging studies. Initially, doctors may perform a detailed history and physical exam, focusing on dietary habits and exposure history. Laboratory tests often include microscopic examination of sputum or stool samples to detect parasite eggs. Serologic tests that identify specific antibodies against Paragonimus can provide supportive evidence. Chest X-rays or CT scans usually reveal characteristic abnormalities like nodules, cysts, or lung infiltrates. In some instances, biopsies may be necessary to confirm the diagnosis.

Treatment Protocols: Treatment typically involves antiparasitic medications such as praziquantel, which is effective in eradicating the parasite. The medication dosage and duration depend on the severity of the infection. Adjunct therapies may include supportive care to manage symptoms, such as pain relief or oxygen therapy if breathing difficulties are severe. Preventive measures focus on avoiding consumption of raw or undercooked freshwater crustaceans, ensuring proper cooking and food hygiene. Following treatment, medical evaluation is important to confirm complete eradication of the parasite and monitor for possible relapses.