Synthesised from the abstracts and full texts of the most-cited and representative papers within a harvested corpus of 718 records (587 open access). A curated review of landmark findings, not an exhaustive catalogue. Generated 2026-06-12.
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Sacbrood virus (SBV) is a positive-sense, single-stranded RNA virus of the family Iflaviridae and one of the first honey bee viruses ever described. It is a disease of larvae: infected larvae fail to pupate and die, their bodies becoming fluid-filled sacs of ecdysial fluid under the unshed skin — the namesake 'sac'. In the Western honey bee SBV is highly prevalent but usually causes only sporadic, low-level brood loss; in the Asian honey bee Apis cerana, the related Chinese sacbrood virus can be devastating. SBV was among the first bee viruses to have its genome fully sequenced, exists as multiple genotypes, and spreads through food, vertical and mite-mediated routes. This document synthesises the findings by theme and catalogues the landmark studies.
SBV is a member of the family Iflaviridae. Its genome was among the first bee-virus genomes fully sequenced: 8,832 nucleotides with a single large open reading frame encoding a 2,858-amino-acid polyprotein, with the structural (capsid) genes at the 5′ end and the non-structural enzymes (helicase, protease, RNA-dependent RNA polymerase) at the 3′ end — a picornavirus-like organization (Ghosh 1999). It is distantly related to infectious flacherie virus of the silkworm (Ghosh 1999). The disease is one of larvae: infection prevents pupation, and the larva dies with its body fluid trapped under the unshed cuticle, forming the characteristic fluid-filled 'sac' (Grabensteiner 2001). Because no honey bee cell lines exist, SBV cannot be cultured, so molecular (RT-PCR) detection superseded older microscopy/serology methods (Grabensteiner 2001).
SBV exists as multiple genotypes: phylogenetic analysis of isolates from geographically distinct regions revealed at least three distinct SBV genotypes (Grabensteiner 2001). In the Western honey bee SBV is one of the most prevalent and widely distributed viruses — found in 86% of French apiaries in adults and 80% in pupae, and in 45% of Varroa samples (Tentcheva 2004) — yet usually causes only sporadic, self-limiting brood loss. The picture differs sharply in the Asian honey bee Apis cerana, where the related Chinese sacbrood virus produces severe, frequently colony-destroying epidemics, making sacbrood one of the most economically damaging diseases of A. cerana beekeeping.
SBV uses several transmission routes, studied in detail alongside Kashmir bee virus (Shen 2005). Food-borne/horizontal transmission is prominent: SBV is present in brood food, honey, pollen and royal jelly, and is detected across all developmental stages — nurse bees infect larvae through contaminated food (Shen 2005; Singh 2010). Vertical (transovarial) transmission occurs, with SBV RNA detected in queens and eggs (Shen 2005; Chen 2006). The mite Varroa destructor provides an additional horizontal route — SBV was detected in mites and their saliva (Shen 2005) — although, unlike DWV, SBV is not strongly dependent on Varroa and its titres do not track mite infestation closely.
Applied & Environmental Microbiology · 2004 · 285 citations
Objective. Large-scale PCR survey of six viruses across 36 French apiaries.
Findings:
SBV found in 86% of apiaries (adults) and 80% (pupae) — among the most prevalent viruses.
SBV detected in 45% of Varroa samples.
Infections persisted without clinical signs in seemingly healthy colonies.
J. General Virology · 1999 · 123 citations
Objective. Sequenced and characterised the SBV genome.
Findings:
SBV genome is 8,832 nt with a single large ORF encoding a 2,858-aa polyprotein.
Structural genes at the 5′ end; helicase, protease and RdRp at the 3′ end (picornavirus-like order).
Distantly related to infectious flacherie virus of the silkworm.
Established SBV as a picorna-like insect virus (now family Iflaviridae).
J. General Virology · 2005 · 117 citations
Objective. Systematically studied SBV/KBV transmission across stages, castes and mites.
Findings:
SBV detected in all developmental stages and in food sources (brood food, honey, pollen, royal jelly).
SBV RNA found in queens and eggs — evidence of transovarial (vertical) transmission.
SBV detected in Varroa mites and their saliva — a route of mite-mediated horizontal transmission.
First detection of co-occurrence of viruses in Varroa, underlining the mite's role in vectoring.
Clin. Diagnostic Lab. Immunology · 2001 · 99 citations
Objective. Developed an RT-PCR assay and analysed SBV phylogeny.
Findings:
SBV infects larvae, causing failure to pupate and death.
Developed a rapid, specific, sensitive RT-PCR test detecting SBV regardless of geographic origin.
Phylogenetic analysis suggested at least three distinct SBV genotypes.
Noted SBV cannot be cultured (no honey bee cell lines), motivating molecular diagnostics.
PLoS ONE · 2010 · 283 citations
Objective. Surveyed viruses in bees, pollen and non-Apis pollinators.
Findings:
First detection of SBV (with DWV, BQCV) in pollen pellets; contaminated food was infective.
SBV detected across multiple non-Apis hymenopteran species.
Applied & Environmental Microbiology · 2006 · 165 citations
Objective. Examined queen tissues and offspring for six viruses including SBV.
Findings:
Insects · 2020 · 132 citations
Objective. Synthesised global diversity and distribution of A. mellifera viruses.
Findings:
SBV is among the most prevalent and most widely distributed bee viruses.
Often multi-host; global trade contributes to dissemination.
J. Invertebrate Pathology · 2004 · 118 citations
Objective. Screened colonies for mixed infections and analysed viral phylogeny.
Findings:
Phylogenetically, SBV groups with DWV in the iflavirus clade (distinct from KBV/BQCV).
Individual bees can carry SBV alongside three other viruses simultaneously.
This hub is a curated synthesis of representative and most-cited studies — not an exhaustive catalogue. The full SBV corpus is searchable here.