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Are the White Strings Worms or Parasites?
Usually, no.
White stringy strands in cooked beef are far more likely to be normal connective tissue, collagen, fat, or separated muscle fibers than parasites.
However, it is important not to claim that unusual-looking meat can never be associated with a food-safety problem. The appearance of a single white strand is not enough to diagnose what it is.
If the meat looks or smells abnormal, was improperly stored, or you have another reason to suspect contamination, it is safer not
