The tests are not perfect but can be useful in conjunction with doctor-prescribed elimination diets and food challenges, which involve ingesting the allergen under a doctor's supervision, Pistiner said.
Public anger over the incident hastened the passing of a food-safety law in 2009 which was intended to tighten standards, improve supervision and impose tougher penalties on violators.
The agency recommends that use of "medically important antimicrobial drugs" in food-producing animals be restricted to situations where they are necessary to ensure animal health, and used under veterinary supervision, Isa said.