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biosafety level 4

METPO:1001105 · CLASS · REVIEWED

A biosafety level that poses extreme risk of life-threatening disease through aerosol transmission with no available treatment.

BSL-4 extreme-hazard classification

DOI-backed graph linking extreme virulence, aerosol transmissibility, and absence of available treatments to BSL-4 classification.

BSL-4 extreme-hazard classification Interactive directed graph showing evidence-backed causal relationships for biosafety level 4.

Edge evidence

  • extreme pathogen hazard produces biosafety level 4 METPO:2000202

    Extreme pathogen hazard without available treatment yields BSL-4 classification.

    • DOI:10.1146/annurev.micro.62.081307.162938 virulence factors Supports extreme virulence with absent countermeasures as the basis of BSL-4 classification.
  • biosafety level 4 is a biosafety level rdfs:subClassOf

    BSL-4 is a member of the biosafety-level classification.

    • DOI:10.1146/annurev.micro.62.081307.162938 virulence factors Supports BSL-4 as a member of the biosafety-level classification.
  • life-threatening disease requires containment level biosafety level 4

    Organisms causing life-threatening disease in a healthy host require BSL-4 maximum containment.

    • DOI:10.1016/j.pathol.2020.09.006 "Organisms that cause life-threatening disease in a healthy host..."
    • DOI:10.3390/laboratories1030013 BSL-4 as the highest containment level for the most dangerous, life-threatening agents.
  • absence of effective prevention or treatment requires containment level biosafety level 4

    Absence of effective prevention or treatment for an agent mandates BSL-4 containment.

    • DOI:10.1016/j.pathol.2020.09.006 "effective prevention and/or treatment are not usually available"
    • DOI:10.3390/laboratories1030013 BSL-4 representing maximum containment for agents with severe risks and no available treatments.
  • high risk of aerosol-transmitted laboratory infection requires containment level biosafety level 4

    High risk of aerosol-transmitted laboratory infection is a defining BSL-4 criterion.

    • DOI:10.1016/j.pathol.2020.09.006 "pose a high risk of aerosol-transmitted laboratory infections with no vaccine or therapy"
  • biosafety level 4 necessitates use of positive-pressure air-supplied suit

    BSL-4 containment necessitates wearing a full-body positive-pressure air-supplied suit.

    • DOI:10.1016/j.pathol.2020.09.006 "wearing a full body, positive pressure, air supplied suit"
    • DOI:10.3390/laboratories1030013 Suit labs adopted positive pressure suits as a hallmark advanced containment strategy.
  • biosafety level 4 requires airlock

    BSL-4 facilities require airlocks as a maximum-containment engineering control.

    • DOI:10.3390/laboratories1030013 "requires airlocks, showers, and specialized waste disposal"
  • biosafety level 4 requires decontamination shower

    BSL-4 facilities require personnel decontamination showers.

    • DOI:10.3390/laboratories1030013 "requires airlocks, showers, and specialized waste disposal"
  • biosafety level 4 requires specialized waste disposal

    BSL-4 facilities require specialized waste disposal systems.

    • DOI:10.3390/laboratories1030013 "requires airlocks, showers, and specialized waste disposal"

Knowledge gaps & discussions (1)

KNOWLEDGE_GAP OPEN Knowledge gap for biosafety level 4: Finally, this review examines the largely unknown microbiology and infection implications of celestial body habitation with an emphasis placed on Mars.

Surfaced by the Europe PMC literature gap-signal scan (categories: explicit_gap, future_work, limitations_barriers, unclear_unknown). Curator review required: set attaches_to, refine the prompt, and weigh the cited evidence.

4 evidence item(s)
NO_EVIDENCE PMID:37362850 Finally, this review examines the largely unknown microbiology and infection implications of celestial body habitation with an emphasis placed on Mars. Gap-signal sentence (unclear_unknown) from the cited abstract.
NO_EVIDENCE PMID:41914886 Both Old World arenaviruses LASV and LCMV exploit host tyrosine kinase signaling to establish infection, though the molecular mechanisms remain incompletely understood. Gap-signal sentence (unclear_unknown) from the cited abstract.
NO_EVIDENCE PMID:40044492 However, the comparatively low scientific commitment of countries that are usually among the major players in global scientific publications and the declining scientific interest in NiV research combined with the prevailing knowledge gaps in NiV infectiology in conjunction with the risk of NiV spreading to other areas is extremely threatening. Gap-signal sentence (explicit_gap) from the cited abstract.
NO_EVIDENCE PMID:39682751 The COVID-19 pandemic has underscored the limitations of focusing solely on the pathogen-killing strategies of immunology and microbiology to address complex, multisystemic infectious diseases. Gap-signal sentence (limitations_barriers) from the cited abstract.

Provenance

Source
METPO (2025-11-25)
Definition source
DOI:10.1146/annurev.micro.62.081307.162938

Parent traits (1)

Synonyms (1)

  • 4 RELATED_SYNONYM · metpo.owl

kg-microbe context

Matched 1 kg-microbe node via direct_metpo.

  • METPO:1001105 [-2.744, -3.128, -2.945, +1.660, …]

512-dim DeepWalkSkipGramEnsmallen embedding from kg-microbe (2026-04-25).

Nearest neighbors in embedding space

Top-8 cosine-similar METPO traits from the 2026-04-25 deepwalk (512-D).

Curation history

  1. · SEEDED_FROM_METPO · seed_from_metpo

    imported from data/raw/metpo.owl (CLASS)

  2. · CURATED_CAUSAL_GRAPH · claude

    Added DOI-backed causal graph linking extreme pathogen hazard to BSL-4 classification.

  3. · GROUND_CAUSAL_PREDICATES · claude

    Grounded 2 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (METPO:2000202×1, rdfs:subClassOf×1).

  4. · ENRICH_CAUSAL_GRAPH · claude

    Added 7 evidence-backed generic edges (7 new nodes) from the deep-research report.