Paenibacillus larvae is best described as what type of organism?

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Paenibacillus larvae is a bacterium, a single-celled prokaryotic organism. It is rod-shaped, Gram-positive, and forms endospores that help it survive harsh conditions. This cellular, prokaryotic nature distinguishes it from viruses (which are non-cellular parasites), protozoa (which are eukaryotic single-celled organisms), and fungi (which are eukaryotic organisms with different cellular structures). This organism is known for causing American foulbrood in honey bees, linking its identity directly to being a bacterium.