🔍 Search transmission papers · 📂 Browse the corpus · 🦟 Varroa as a virus vector · 🌡️ Thermotherapy · 🧬 Virus hubs
A practical synthesis answering the beekeeper questions: how do viruses move around inside and between hives, what actually kills them, how long do they survive in comb, stores, and woodenware — and what does that mean for reusing a deadout? Papers held in the archive link to the local 📄 PDF. Curated, not exhaustive.
Honey bee viruses are non-enveloped, positive-sense RNA viruses (picornavirus-like). Inside a colony they move along several overlapping routes, and the route largely determines how dangerous the infection is:
A colony collapsing from Varroa/DWV is not just a loss — it's a transmission source for the whole neighborhood:
One caveat for honesty: most of this evidence tracks mites moving between colonies, with virus inferred because the mites carry it. No study has directly measured virus titres in robbers returning from a deadout.
Being non-enveloped, these viruses are relatively tough — no lipid envelope to disrupt — but they cannot replicate outside a bee, so everything outside a host is a decay curve. Levers that steepen it, now with actual temperature numbers:
This is where the evidence sharpened most. The answer splits by material:
| Study | Year | What it establishes |
|---|---|---|
| Singh et al. — RNA viruses in hymenopteran pollinators: inter-taxa transmission via pollen | 2010 | DWV in stored honey/bee-bread frames infectious after 6 months ambient; fed-back frames infect clean colonies in 2–3 weeks |
| Schittny et al. — Honey bee virus transmission via hive products | 2020 | Oral dose threshold ~10⁶–10⁷ copies/g; honey > pollen as vehicle; commercial products low-titer; wax transmission proof-of-principle |
| Peck & Seeley — Mite bombs or robber lures? Varroa transmission from collapsing colonies | 2019 | Robbing of collapsing (DWV-symptomatic) colonies moves mites/virus to neighbors near and far |
| Kulhanek et al. — Accelerated Varroa growth associated with visitation from non-natal bees | 2021 | Foreign-bee traffic drives fall mite immigration; robbing screens reduce it |
| Betti & Shaw — A multi-scale model of disease transfer in honey bee colonies | 2021 | Drift dominates spread in dense apiaries; robbing dominates when drift is rare |
| Woodford et al. — Geographically coordinated miticide treatment benefits bee health | 2023 | Robbing/drifting workers carry mites that introduce new DWV variants into treated colonies |
| Forfert et al. — Parasites and pathogens and inter-colonial transmission | 2015 | Varroa-infested colonies accept more drifters; viruses alone didn't increase drifting |
| Gusachenko et al. — DWV spillover from honey bees to bumble bees | 2020 | Robbed-out collapsing colonies as an oral DWV acquisition source |
| DeGrandi-Hoffman et al. — Are dispersal mechanisms increasing Varroa virulence? | 2017 | Virus-impaired cognition may promote drift, co-dispersing mite and virus |
| Erez & Chejanovsky — Infection of a lepidopteran cell line with DWV | 2020 | DWV inactivated at 85 °C for 10 min |
| Hu et al. — Biological characteristics of three strains of Chinese sacbrood virus | 2016 | CSBV inactivated at 75 °C × 1 h; survives 50–70 °C |
| McMenamin et al. — The heat shock response in the western honey bee is antiviral | 2020 | 42 °C/4 h heat pulse cuts virus abundance 74–90% in living bees (host response) |
| Xu et al. — Influence of hyperthermia on Varroa, viral infections, and bee health | 2025 | Field thermotherapy lowered DWV and ABPV loads in treated colonies |
| Colwell et al. — Treatment of waxborne viruses using time, temperature, and e-beam | 2024 | Wax-borne virus decay over 30 days (DWV −17%, BQCV −51%); temperature-independent; e-beam 35–45 kGy effective |
| Colwell et al. — Mechanical transfer of virus sequences to wax by worker traffic | 2025 | Worker foot traffic deposits virus on comb; virus sequences on winter-deadout wax |
| Mazzei et al. — Infectivity of DWV associated to flower pollen | 2014 | Pollen-associated DWV is replication-competent |
| Beaurepaire et al. — Diversity and global distribution of viruses of the western honey bee | 2020 | DWV in pollen/honey stays infectious despite weeks of sun exposure of combs |
| Yañez et al. — Bee viruses: routes of infection in Hymenoptera | 2020 | Food-borne route incl. royal jelly & hypopharyngeal glands; robbing/drift as inter-colony routes |
| Li et al. — Phylogeny and pathogenesis of sacbrood virus in European honey bees | 2019 | SBV viable in dead larvae, honey, pollen up to four weeks; larval cannibalism route |
| Li et al. — Can egg yolk antibodies terminate the CSBV infection in apiculture? | 2023 | Sunlight, hive replacement, and chemical disinfection as physical/chemical CSBV controls |
| Coulon et al. — CBPV environmental resistance | 2019 | CBPV resistant in pollen, feces, dead bees |
| Figueroa et al. — Bee pathogen transmission review | 2023 | ABPV in feces infectious for months (after Bailey & Gibbs 1964) |
| Tiritelli et al. — Molecular detection of bee pathogens in honey | 2025 | Pathogens routinely detectable in honey; comb transfer flagged as horizontal-transfer risk |
| Tlak Gajger et al. — Strategies to mitigate viral infections in colonies | 2025 | Equipment/trade spread at landscape scale; no standardized tool-disinfection protocols exist |
| de Guzman et al. — Pathogen load of bees reared in gamma-irradiated combs | 2017 | 25 kGy gamma irradiation of comb reduces early-season DWV |
| Nanetti et al. — Pathogen spillover from honey bees to other arthropods | 2021 | Fecal–oral and shared-flower routes; fomite ecology across species |
| Amiri et al. — IAPV: queen–worker interaction and transmission pathways | 2019 | Worker-to-queen horizontal transmission via contact and trophallaxis |
| Amiri et al. — Quantitative patterns of vertical transmission of DWV | 2018 | Queen-to-egg vertical transmission quantified |
| de Miranda & Fries — Venereal and vertical transmission of DWV | 2008 | Semen-borne (venereal) and vertical transmission |
| Möckel et al. — Horizontal transmission of DWV: route-dependent consequences | 2011 | Injection vs oral dose–response; why vectored transmission is lethal |
🔍 Search these papers · 📖 DWV hub · 📖 Sacbrood hub · 🦟 Varroa virus vectoring · 🌡️ Thermotherapy