Is petting the lizard, lunch from home, or lunch from the zoo the likely source of the

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Is petting the lizard, lunch from home, or lunch from the zoo the likely source of the contamination? Explain your answer.


A preschool class visited the zoo. As part of the trip, they had a chance to pet a large lizard and then had lunch. Some students brought lunch from home; others bought lunch at the zoo. That evening four students became ill.

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