Some websites I have read claim that parasite infection may recur as long as one is mercury toxic. I read that vitamin A helps prevent parasite infection, so I take 20,000 units a day of vitamin a acetate.

Eating garlic, cayenne, horseradish, and turmeric will also help prevent parasite infection. Taking herbs such as olive leaf extract, cat's claw and astralagus will also help fight parasites and candida.

Normally a healthy person has a strong enough immune system to fight off most parasites. Mercury impairs the immune system, and may allow parasite infections to set in.

Candida overgrowth also sets the stage for parasite infection.