If there were a student who got sick but did not pet the lizard, does this mean

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If there were a student who got sick but did not pet the lizard, does this mean petting the lizard is not the source of contamination? What other explanations could there be?


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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