Taenia solium symptoms
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"Taenia solium" AND "cysticercosis" symptoms
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Taenia solium - Symptoms
T. solium (pork tapeworm) causes two distinct clinical syndromes with very different symptom profiles: taeniasis (adult worm in the gut) and cysticercosis (larval infection in tissues).
1. Taeniasis (Intestinal Infection)
Caused by eating undercooked pork containing cysticerci. The adult worm attaches to the small intestinal wall via its scolex (equipped with 4 suckers and a crown of hooklets).
Symptoms are typically mild:
- Nausea
- Abdominal discomfort / cramping
- Anorexia
- Chronic indigestion
- Diarrhea
- Perianal pruritus
- Passing of proglottid segments in stool (the most commonly noticed sign - off-white segments, ~2 cm long)
Many patients are asymptomatic and notice only the passage of proglottids. Notably, unlike T. saginata, the proglottids of T. solium do not actively migrate out of the anus on their own.
- Medical Microbiology 9e, p. 2651
- Goldman-Cecil Medicine, p. 4250
2. Cysticercosis (Larval/Tissue Infection)
Caused by ingestion of T. solium eggs (from fecally contaminated food/water, or via autoinfection from a tapeworm carrier). The hatched larvae (oncospheres) penetrate the gut wall, enter the bloodstream, and encyst in tissues - most dangerously in the central nervous system (neurocysticercosis).
This is the far more dangerous form of infection and a leading cause of acquired epilepsy worldwide.
Neurocysticercosis (NCC) - Brain/Spinal Cord
The most common and serious manifestation. Symptoms depend on the location and number of cysts, and whether they are viable, degenerating, or calcified:
| Symptom | Notes |
|---|---|
| Seizures / Epilepsy | Most common presentation; occurs in up to 70-90% of symptomatic NCC cases; can be focal or generalized |
| Headache | Often due to increased intracranial pressure |
| Hydrocephalus | Cysts in ventricles (especially 4th ventricle) cause obstructive hydrocephalus |
| Focal neurological deficits | Weakness, sensory loss, depending on cyst location |
| Signs of raised ICP | Papilledema, vomiting, altered consciousness |
| Meningitis / Arachnoiditis | From subarachnoid cysts - causes vasculitis and stroke-like events |
| Cognitive decline / dementia | In heavy infections with multiple cysts |
| Movement disorders | Choreoathetosis, parkinsonism (rare, but documented) |
| Spinal cord compression | From spinal cysticercosis - back pain, radiculopathy, myelopathy |
Recent systematic reviews (2025) confirm movement disorders as a recognized neurological manifestation of NCC, and spinal NCC as a serious complication causing significant morbidity.
- Harrison's Principles of Internal Medicine 22E, p. 1877
Subcutaneous / Muscular Cysticercosis
- Palpable, non-tender subcutaneous nodules (rubbery lumps under skin)
- Muscle pain or pseudohypertrophy in heavy infection
Ocular Cysticercosis
- Visual disturbances or loss of vision
- Floaters or vitreous involvement
- Visible subretinal cysticercus on fundoscopy (an absolute diagnostic criterion)
Key Distinctions
| Feature | Taeniasis (adult worm) | Cysticercosis (larval stage) |
|---|---|---|
| Source | Eating infected pork | Ingesting eggs (contaminated food/water, autoinfection) |
| Location | Intestine | Brain, muscle, eye, skin |
| Severity | Mild / often asymptomatic | Potentially fatal (especially NCC) |
| Main symptom | Passage of proglottids | Seizures, headache, hydrocephalus |
Important Note
A person carrying the adult tapeworm can self-infect by accidentally ingesting their own shed eggs, leading to cysticercosis. This is why treating tapeworm carriers is a public health priority.
Treatment for taeniasis uses praziquantel (single dose) or niclosamide. Neurocysticercosis is managed with albendazole +/- praziquantel, antiseizure medications, corticosteroids, and sometimes neurosurgery for ventricular cysts.
- Goldman-Cecil Medicine International Edition, p. 4236-4261
- Harrison's Principles of Internal Medicine 22E (2025), p. 1877-1878
- Medical Microbiology 9e, p. 2647-2687
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