1. Maria bought an egg sandwich from a side walk vendor. The vendor places it in an open container. Mara walked all the way home while holding the sandwich. Upon arrival, she ate the sandwich and finished it. At midnight, she felt pain on her abdomen and later on she vomits and had a diarrhea. What do you think the vendor should do to prevent this kind of incidents to happen to his, her customers in the future? Share your insights.

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