Food poisoning can be caused by various pathogens, including:
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Bacteria: Common bacteria associated with food poisoning include Salmonella, E. coli, Listeria, and Campylobacter.
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Viruses: Viruses such as Norovirus and Hepatitis A can also cause foodborne illnesses.
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Protozoans: Certain protozoan parasites like Giardia and Cryptosporidium can lead to food poisoning.
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Fungi: While fungi themselves are less commonly associated with traditional food poisoning, some molds can produce mycotoxins that can be harmful if ingested.
In summary, all four options—bacteria, viruses, protozoans, and fungi (in certain cases)—can cause food poisoning.