According to ServSafe guidelines, the following situations are considered unsafe due to the potential for cross-contamination:
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Jane debones raw chicken on a white cutting board. She immediately uses the same knife and cutting board to dice tomatoes.
- This is unsafe because using the same cutting board and knife for raw chicken and then for ready-to-eat tomatoes can transfer harmful pathogens from the raw chicken to the vegetables, risking foodborne illness.
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Alexa preps salads from 6:00 am to 8:00 am. She cleans and sanitizes the prep table, knife, and cutting board. Ted filets raw fish on the same prep table at 9:00 am.
- This is unsafe because although the prep table was cleaned and sanitized before Ted worked with raw fish, there may still be a risk of cross-contamination if the prep table was not cleaned and sanitized immediately before it was used for handling the salads.
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Jane uses a spatula to handle raw hamburgers. She places them in a container. After 10 minutes, she used the same spatula to handle fresh buns from the oven.
- This is also unsafe as it presents a risk of cross-contamination due to using the same spatula that handled raw meat (which could harbor pathogens) to handle ready-to-eat food like fresh buns.
John trimming a raw roast on a red cutting board, washing hands, putting on new gloves, and using a new knife to slice green onions on a green cutting board is safe because he is following proper procedures to prevent cross-contamination.
So, the unsafe situations are the first, third, and fourth ones.