identifier: METPO:1001101 label: biosafety level definition: A quality that categorizes biological agents according to their hazard level and required containment measures. definition_source: DOI:10.1146/annurev.micro.62.081307.162938 trait_category: ECOLOGY term_kind: CLASS mapping_status: REVIEWED parent_traits: - METPO:1000188 synonyms: - synonym_text: Safety information.risk assessment.biosafety level synonym_type: RELATED_SYNONYM source: metpo.owl evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: virulence factors notes: Virulence-factor review supports pathogen virulence characteristics (transmissibility, severity, treatability) as the biological inputs underlying biosafety-level classification. - reference: DOI:10.1038/nrmicro1592 snippet: secretion systems notes: Secretion-systems review supports effector-mediated host damage as a virulence axis informing hazard assessment. causal_graphs: - graph_id: biosafety_level_hazard_classification title: Biosafety-level hazard-classification axis description: DOI-backed graph framing biosafety level as a hazard-based classification driven by pathogen transmissibility, disease severity, and availability of countermeasures, with `is a` edges to the BSL-1 through BSL-5 child classifications. nodes: - node_id: biosafety_level_trait label: biosafety level node_type: TRAIT grounding: METPO:1001101 description: Classification of a biological agent's hazard level and required containment. - node_id: pathogen_hazard_properties label: pathogen hazard properties node_type: BIOLOGICAL_PROCESS description: Pathogen transmissibility, disease severity, and availability of vaccines or therapeutics that together determine biosafety classification. - node_id: containment_requirements label: containment requirements node_type: EXPERIMENTAL_FACTOR description: Laboratory practices, equipment, and facility features mandated for safe handling of the agent. - node_id: bsl1 label: biosafety level 1 node_type: TRAIT grounding: METPO:1001102 description: Agents posing minimal hazard; standard laboratory practices. - node_id: bsl2 label: biosafety level 2 node_type: TRAIT grounding: METPO:1001103 description: Agents posing moderate risk; biosafety cabinets and PPE required. - node_id: bsl3 label: biosafety level 3 node_type: TRAIT grounding: METPO:1001104 description: Agents that can cause serious or potentially lethal disease; controlled-access containment. - node_id: bsl4 label: biosafety level 4 node_type: TRAIT grounding: METPO:1001105 description: Extreme-risk agents; maximum containment (positive-pressure suits, dedicated facilities). - node_id: bsl5 label: biosafety level 5 node_type: TRAIT grounding: METPO:1001106 description: Proposed enhanced classification beyond BSL-4. - node_id: risk_assessment label: hazard identification and risk assessment node_type: BIOLOGICAL_PROCESS description: Cyclical biorisk process of gathering information, evaluating risks, and selecting control measures. - node_id: risk_group_classification label: risk group classification (RG1-RG4) node_type: QUALITY description: Classification of biological agents into risk groups RG1-RG4 based on hazard. - node_id: aerosol_transmission label: aerosol/inhalation transmission route node_type: BIOLOGICAL_PROCESS description: Capacity of an agent to be transmitted via inhalation or aerosol. - node_id: bsl3_containment label: BSL-3 containment requirement node_type: EXPERIMENTAL_FACTOR description: Controlled-access containment for agents causing serious or lethal disease via inhalation. - node_id: lack_of_countermeasures label: lack of effective treatment or vaccine node_type: QUALITY description: Absence of available vaccines or therapeutics for a dangerous, life-threatening agent. - node_id: bsl4_containment label: BSL-4 containment requirement node_type: EXPERIMENTAL_FACTOR description: Maximum containment for highly dangerous agents often lacking vaccines or treatments. - node_id: infectious_dose label: infectious dose node_type: QUALITY description: Dose of agent required to cause infection; a practical criterion in biorisk assessment. edges: - subject: pathogen_hazard_properties predicate: causes object: biosafety_level_trait description: Pathogen transmissibility, severity, and treatability jointly determine biosafety-level classification. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: virulence factors notes: Supports pathogen virulence properties as the biological inputs for hazard-level classification. predicate_id: biolink:causes - subject: biosafety_level_trait predicate: mandates object: containment_requirements description: Each biosafety level mandates specific containment practices and engineering controls. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: pathogenesis notes: Supports pathogen pathogenesis as the basis for graduated containment requirements. - subject: bsl1 predicate: is a object: biosafety_level_trait description: BSL-1 is a biosafety-level classification. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: host notes: Supports the host-pathogen framing underlying hazard classification, including the minimal-hazard BSL-1 tier. predicate_id: rdfs:subClassOf - subject: bsl2 predicate: is a object: biosafety_level_trait description: BSL-2 is a biosafety-level classification. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: infection notes: Supports community-acquired infection as the hazard profile underlying the BSL-2 tier. predicate_id: rdfs:subClassOf - subject: bsl3 predicate: is a object: biosafety_level_trait description: BSL-3 is a biosafety-level classification. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: pathogen notes: Supports serious-pathogen severity (aerosol-transmissible disease) as the hazard profile underlying the BSL-3 tier. predicate_id: rdfs:subClassOf - subject: bsl4 predicate: is a object: biosafety_level_trait description: BSL-4 is a biosafety-level classification. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: toxins notes: Supports extreme-toxicity and untreatable-pathogen profiles as the hazard basis for the BSL-4 tier. predicate_id: rdfs:subClassOf - subject: bsl5 predicate: is a object: biosafety_level_trait description: BSL-5 is a proposed biosafety-level classification beyond BSL-4. evidence: - reference: DOI:10.1146/annurev.micro.62.081307.162938 snippet: host cells notes: Supports host-cell pathogen interactions, generalised to hypothetical post-BSL-4 hazards, as motivating the proposed BSL-5 tier. predicate_id: rdfs:subClassOf - subject: risk_assessment predicate: guides selection of object: containment_requirements description: Hazard identification and risk assessment guide selection of containment/control measures. evidence: - reference: DOI:10.1016/j.jobb.2021.09.002 notes: WHO LBM4 cyclical process of evaluating risks and selecting and implementing control measures. - subject: risk_group_classification predicate: informs object: biosafety_level_trait description: Risk group classification (RG1-RG4) maps to / informs the biosafety containment level. evidence: - reference: DOI:10.3390/laboratories1030013 notes: BSL categories are progressive containment categories linked to risk group/hazard classification. - subject: aerosol_transmission predicate: increases requirement for object: bsl3_containment description: Inhalation/aerosol transmissibility increases the requirement for BSL-3 containment. evidence: - reference: DOI:10.3390/laboratories1030013 notes: BSL-3 is for agents that may cause serious or lethal diseases through inhalation. - subject: lack_of_countermeasures predicate: supports classification at object: bsl4_containment description: Absence of effective treatment or vaccine supports classification at BSL-4. evidence: - reference: DOI:10.3390/laboratories1030013 notes: BSL-4 covers highly dangerous, life-threatening agents often lacking vaccines or treatments. - subject: aerosol_transmission predicate: is input to object: risk_assessment description: Route of inoculation / modes of transmission is a practical input to biorisk assessment. evidence: - reference: DOI:10.1089/apb.2022.0040 notes: BRM focused on route of inoculation/modes of transmission as a practical criterion in biorisk assessment. - subject: infectious_dose predicate: is input to object: risk_assessment description: Infectious dose is a practical criterion used in biosafety risk assessment. evidence: - reference: DOI:10.1089/apb.2022.0040 notes: BRM identified infectious dose among the practical criteria used in biosafety risk assessment. curation_history: - timestamp: '2026-05-05T01:35:46.931935+00:00' curator: seed_from_metpo action: SEEDED_FROM_METPO changes: imported from data/raw/metpo.owl (CLASS) llm_assisted: false - timestamp: '2026-05-13T13:30:00-07:00' curator: claude action: CURATED_CAUSAL_GRAPH changes: Added DOI-backed causal graph framing biosafety level as a hazard-classification axis driven by pathogen virulence properties, with is-a edges to the five BSL child classifications. llm_assisted: true - timestamp: '2026-05-20T03:35:29Z' curator: claude action: GROUND_CAUSAL_PREDICATES changes: Grounded 5 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (rdfs:subClassOf×5). llm_assisted: true - timestamp: '2026-05-26T05:00:47Z' curator: claude action: RENAME_PREDICATE_LABELS changes: 'Renamed 1 causal-edge predicate label(s) to align with existing groundings: determines → causes ×1.' llm_assisted: true - timestamp: '2026-05-26T05:00:49Z' curator: claude action: GROUND_CAUSAL_PREDICATES changes: Grounded 1 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (biolink:causes×1). llm_assisted: true - timestamp: '2026-06-23T00:00:00Z' curator: claude action: ENRICH_CAUSAL_GRAPH changes: Added 6 evidence-backed generic edges (7 new nodes) from the deep-research report. llm_assisted: true discussions: - discussion_id: kgscan-93e87bc8aba3 prompt: 'Knowledge gap for biosafety level: Additionally, it identifies ongoing challenges and critical knowledge gaps for future research.' kind: KNOWLEDGE_GAP status: OPEN rationale: 'Surfaced by the Europe PMC literature gap-signal scan (categories: controversy_conflict, explicit_gap, future_work, limitations_barriers, unclear_unknown). Curator review required: set attaches_to, refine the prompt, and weigh the cited evidence.' attaches_to: [] evidence: - reference: PMID:41494000 supports: NO_EVIDENCE evidence_source: abstract snippet: Additionally, it identifies ongoing challenges and critical knowledge gaps for future research. explanation: Gap-signal sentence (explicit_gap, future_work, limitations_barriers) from the cited abstract. - reference: PMID:41556562 supports: NO_EVIDENCE evidence_source: abstract snippet: This review outlines the possibilities, as well as the limitations of their use in food production. explanation: Gap-signal sentence (limitations_barriers) from the cited abstract. - reference: PMID:41647993 supports: NO_EVIDENCE evidence_source: abstract snippet: Given the knowledge gap on the characteristics and significance of microbiome in early-onset pancreatic ductal adenocarcinoma (eoPDAC, age 50 years). explanation: Gap-signal sentence (explicit_gap) from the cited abstract. - reference: PMID:41683313 supports: NO_EVIDENCE evidence_source: abstract snippet: 'Background : Untargeted microbiome modulation has achieved conflicting results in post-infectious irritable bowel syndrome (PI-IBS).' explanation: Gap-signal sentence (controversy_conflict) from the cited abstract. posed_by: kg-microbe-kgscan