Wilson Kimball was 40 years old when she found herself in the emergency room vomiting and suffering a severe migraine. Doctors were unable to pinpoint the cause, so after several days of testing, they released Kimball. On the way home, she stopped at her favorite deli and ordered tuna salad, made the Italian way with oil and vinegar instead of mayonnaise. The vomiting immediately returned, but this time Kimball was able to help doctors figure out the culprit: An allergy to the mold in vinegar.

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