What is the estimated number of spores found in the dried remains of a single larva infected by American foulbrood?

The estimated number of spores found in the dried remains of a single larva infected by American foulbrood is approximately 2.5 billion spores. This staggering number is significant in understanding the infectious nature of the disease caused by the bacterium Paenibacillus larvae. When a larva becomes infected, it not only succumbs to the infection but also serves as a reservoir that can lead to further infections in a hive. The high spore count illustrates why American foulbrood is such a formidable disease in beekeeping. If a beekeeper encounters a single infected larva, they must be aware of the potential for widespread contamination within the entire colony, as these spores can persist in the environment and infect other larvae. The sheer volume of spores underscores the importance of rigorous inspection and management practices to prevent outbreaks and protect bee populations.