Food commonly contains bacteria and fungi, including molds and yeasts, along with viruses and parasites. Bacteria are unicellular and vary in shape (e.g., bacilli, cocci, vibrio, spirillum), while molds are multicellular with filamentous morphology. Yeasts are unicellular and reproduce by budding. Viruses, requiring a host to reproduce, and parasitic organisms like cestodes, trematodes, nematodes, and protozoa can also contaminate food, posing health risks.
