Peanut allergy is one of the most prevalent food allergies in the United States. More than three million people in the United States are allergic to peanuts, and that number is only increasing. For those with peanut allergy, exposure to peanuts results in mild to severe allergic reactions, including swelling, itching, shortness of breath, and nausea.
People with peanut allergy must be extremely vigilant, paying close attention to everything they eat in order to avoid accidentally eating peanuts. Packaged foods often have labels that state whether they were prepared in facilities that also process peanuts. This information helps protect against the accidental consumption of peanuts.
What is the meaning of vigilant as used in the passage?
watchful
prepared
knowledgeable
healthy
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