> We note that no data are available that show a relationship of microbiota diversity to health of colonies or individual bees. Indeed, if some of the microbial diversity consists of pathogens, then greater diversity might be as likely to represent disease as health.

> In the case of the honey bee gut microbiota, members of the Enterobacteriaceae species groups are erratically present among individuals, an observation that does raise the possibility that their presence represents a disease state. 

Sabree ZL, Hansen AK, Moran NA (2012) Independent Studies Using Deep Sequencing Resolve the Same Set of Core Bacterial Species Dominating Gut Communities of Honey Bees. 
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