Which of the five common pathogens found in raw milk is a protozoan?

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Multiple Choice

Which of the five common pathogens found in raw milk is a protozoan?

Explanation:
Protozoan pathogens are single-celled eukaryotes, distinct from bacteria. Among the options, Cryptosporidium is the protozoan. The other organisms listed are bacteria—Campylobacter and Salmonella are bacterial pathogens that cause gastroenteritis, and Listeria monocytogenes is a bacterial cause of listeriosis. Cryptosporidium forms hardy oocysts that can contaminate milk and cause cryptosporidiosis when ingested, making it the protozoan among these common raw-milk pathogens.

Protozoan pathogens are single-celled eukaryotes, distinct from bacteria. Among the options, Cryptosporidium is the protozoan. The other organisms listed are bacteria—Campylobacter and Salmonella are bacterial pathogens that cause gastroenteritis, and Listeria monocytogenes is a bacterial cause of listeriosis. Cryptosporidium forms hardy oocysts that can contaminate milk and cause cryptosporidiosis when ingested, making it the protozoan among these common raw-milk pathogens.

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