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A high-throughput sequencing survey characterizing European foulbrood disease and Varroosis in honey bees
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A high-throughput sequencing survey characterizing European foulbrood disease and Varroosis in honey bees
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A high-throughput sequencing survey characterizing European foulbrood disease and Varroosis in honey bees
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Journal Article
A high-throughput sequencing survey characterizing European foulbrood disease and Varroosis in honey bees
2023
Overview
As essential pollinators of ecosystems and agriculture, honey bees (
Apis mellifera
) are host to a variety of pathogens that result in colony loss. Two highly prevalent larval diseases are European foulbrood (EFB) attributed to the bacterium
Melissococcus plutonius,
and Varroosis wherein larvae can be afflicted by one or more paralytic viruses. Here we used high-throughput sequencing and qPCR to detail microbial succession of larval development from six diseased, and one disease-free apiary. The disease-free larval microbiome revealed a variety of disease-associated bacteria in early larval instars, but later developmental stages were dominated by beneficial symbionts. Microbial succession associated with EFB pathology differed by apiary, characterized by associations with various gram-positive bacteria. At one apiary, diseased larvae were uniquely described as “melting and deflated”, symptoms associated with Varroosis. We found that Acute Bee Paralysis Virus (ABPV) levels were significantly associated with these symptoms, and various gram-negative bacteria became opportunistic in the guts of ABPV afflicted larvae. Perhaps contributing to disease progression, the ABPV associated microbiome was significantly depleted of gram-positive bacteria, a likely result of recent antibiotic application. Our results contribute to the understanding of brood disease diagnosis and treatment, a growing problem for beekeeping and agriculture worldwide.
