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Gnathostomiasis
Caused by nematode Gnathostoma spinigerum Acquired by eating uncooked food, esp fish (eg ceviche!)
Gnathostomiasis
Adult worm lives inside gastric wall of definitive host and expels eggs into GI tract 1st stage larva hatch in the presence of water and are then ingested by intermediate hosts, (small crustaceans) where they mature Ingested by second intermediate hosts (fish, frogs, snakes, chickens, pigs), migrate and mature into 3rd stage larva ready to infect humans Most commonly acquired by consumption of undercooked fish (esp tilapia), poultry or pork
Also acquired via penetration of the skin or prenatal transmission Rusnak, CID, 1993
Gnathostomiasis: Clinical
2 forms of disease, visceral and cutaneous
Cutaneous form: Intermittent migratory skin and subcutaneous swellings, eosinophilia CNS involvement (eosinophilic meningitis)
Symptoms occur ~24-48hrs after ingestion with non-specific sx: malaise, fever, urticaria Migrate through subcutaneous tissue migratory swellings for up to 10-12 years!
Rusnak, CID, 1993
Diagnosis: Western blot, performed in Thailand
Thought to be sensitive and specific for this disease
One study examined a case series from 2000-2001
- f 16 patients in a Thai hospital
Median time from symptoms to diagnosis was 12 months Eosinohilia present in 7 patients Treatment: albendazole 400mg BID x 21 days
Moore, EID, 2003