Disease Description (Causes and Symptoms)
Trichinellosis is a zoonotic infection caused by the larvae of parasites of the genus Trichinella. The primary route of infection is consuming raw meat containing larvae, especially pork or processed meat, without cooking it thoroughly. In terms of pathophysiology, the larvae develop into adults in the small-intestinal mucosa, and the larvae they produce spread throughout the body via the bloodstream. They are deposited mainly in skeletal muscles, where they form cysts and trigger inflammation and an immune response.
Main Symptoms and Course
- Incubation period: Several days to several weeks (varies depending on the infective dose and species).
- Early stage (approximately 1 week after infection): Gastrointestinal symptoms (diarrhea, nausea and vomiting, abdominal pain)—when the intestinal mucosa is involved.
- Migration stage (2–6 weeks after infection): Fever, myalgia (especially in proximal muscles), facial edema, conjunctivitis, headache, malaise, sweating, peripheral neuropathy, dyspnea (due to respiratory muscle weakness or pneumonia/complications), and chest pain (possible myocarditis).
- Chronic/recovery stage: Myalgia and muscle weakness may persist for several weeks to several months. Some people may be asymptomatic.
Diagnostic Findings
- Peripheral blood eosinophilia is common.
- Serologic testing (antibody testing) can be used for supportive diagnosis.
- Definitive diagnosis is made by detecting encysted larvae in a muscle biopsy.
- If severe disease is suspected, cardiac enzymes, electrocardiography (for myocarditis), imaging tests, and neurologic evaluation are necessary.
Treatment
Basic principles: Parasite eradication (antiparasitic drugs) + conservative and interventional treatment for symptoms and monitoring for complications
Drug Treatment
- Antiparasitic drugs: Albendazole or mebendazole are first-line drugs. Because the dosage and duration are determined according to the patient’s condition and severity, follow the administration instructions prescribed by the attending physician.
- Steroids: Short-term use is considered only in cases of severe systemic reactions or serious inflammatory complications such as myocarditis or central nervous system involvement (not routinely used in all patients).
- Analgesics/antipyretics: Analgesics are used to relieve myalgia and fever (nonsteroidal anti-inflammatory drugs for mild cases; stronger analgesics may be considered for severe myalgia).
- In cases of severe complications: Myocarditis, respiratory failure, and central nervous system symptoms require inpatient treatment and consultation with the relevant specialties (cardiology, pulmonology, and neurology).
Supportive Care and Follow-up
- Fluid and electrolyte replacement, nutritional management, and rest.
- Cardiac marker and electrocardiography monitoring (when myocarditis is suspected), and observation of respiratory function.
- After treatment, monitor the course through blood tests (CK, eosinophil count, etc.) and clinical symptoms.
Precautions (Daily Management)
- While taking antiparasitic drugs, be aware of medication side effects (gastrointestinal disturbances, abnormal liver test results, etc.) and drug interactions.
- Pregnant or breastfeeding patients should consult a specialist regarding drug selection and administration.
- If severe symptoms such as dyspnea, chest pain, altered mental status, or high fever occur, go immediately to an emergency medical facility.
Checklist Before an Outpatient Visit (Including Sample Questions)
What to Bring
- A list of all medications and supplements currently being taken (including dosage and administration times)
- A record of drug allergies
- Copies of recent test results, if available (blood tests, electrocardiography, chest imaging, etc.)
- Notes summarizing when symptoms began and how they have progressed (when they occurred, what symptoms appeared, and aggravating factors)
- Food and dietary history (including preparation methods during the past 1–2 months; whether raw or undercooked meat, processed meat, or smoked meat was consumed)
- Occupation, animal contact, livestock-rearing history, and travel history
Sample Questions Before Visiting a Doctor (For Patients to Check Themselves)
- Please summarize the onset and changes in your symptoms in one sentence (e.g., when the fever began and which areas are affected by myalgia).
- Have you recently eaten raw or undercooked pork or wild-animal meat? When did you eat it?
- Are you experiencing dyspnea, chest pain, fainting, or decreased consciousness? (If so, immediate emergency treatment is required.)
General Sample Questions to Ask the Doctor
- What tests are needed to confirm the diagnosis of this disease? (Blood tests, antibody testing, muscle biopsy, etc.)
- Will treatment differ depending on the medications I am taking or my chronic illnesses? What are the side effects of the medications?
- How long will recovery take after treatment, and until when should I restrict daily activities (such as exercise or returning to work)?
- What is the risk of complications (myocarditis, respiratory failure, or nervous system involvement), and how will they be monitored?
Sample Disease-Specific Questions
- Does the combination of my symptoms (e.g., facial edema, myalgia, and dyspnea) indicate a high risk of serious complications such as myocarditis or respiratory failure? When should I go to the emergency room?
- I need to take an antiparasitic drug (albendazole/mebendazole). Could you explain the recommended duration of treatment and its safety during pregnancy and breastfeeding?
(If necessary, the diagnosis and treatment plan should be discussed with the attending physician and adjusted to the patient’s condition.)