If you eat oysters for fear of contracting parasites, you can do some tests to confirm the diagnosis, including laboratory tests, ultrasound, and imaging tests such as CT, and active treatment is needed if the diagnosis is confirmed. Generally speaking, only raw oysters can be infected with parasites. Thoroughly cooked oysters have killed the vast majority of parasites and eggs. If you have recently eaten raw oysters that have not been cooked, laboratory tests can be done to confirm infection. Typical laboratory tests include routine stool microscopy for eggs; ultrasound is the biliary tract and liver to rule out hepatic schistosomiasis, etc.; and can be combined with imaging, such as a T-scan, to rule out intestinal parasites as well as intracranial parasites and other problems. If these tests confirm parasitic infection, broad-spectrum antiparasitic drugs such as albendazole can be taken orally under a doctor’s supervision for deworming. If you experience abdominal pain or other discomfort after consuming seafood, seek medical attention as soon as possible.