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Risk Matrix — Biosafety Level 2 Laboratory Risk Assessment

A BSL-2 risk assessment for a fictional viral-vector core covering biological, chemical, physical and ergonomic hazards: controls cut exposure from 87 to 40 (−54%), move eight of nine hazards down a band and leave every residual risk within the Medium appetite, the lentiviral needlestick highest at Medium 6. Illustrative register.

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Viral vector core facility — BSL-2 laboratory risk assessmentLentiviral vector production and in-vivo work · biological, chemical and physical hazardsHEAT MAP · residual position, arrows from inherent11LOWLOW22LOWLOW33LOWLOW44LOWLOW55MEDIUMMEDIUM22LOWLOW44LOWLOW66MEDIUMMEDIUM88MEDIUMMEDIUM1010HIGHHIGH33LOWLOW66MEDIUMMEDIUM99MEDIUMMEDIUM1212HIGHHIGH1515HIGHHIGH44LOWLOW88MEDIUMMEDIUM1212HIGHHIGH1616HIGHHIGH2020CRITICALCRITICAL55MEDIUMMEDIUM1010HIGHHIGH1515HIGHHIGH2020CRITICALCRITICAL2525CRITICALCRITICALB8B2B4B9B3B6B7B1B9B3B4B5B6B7B8B1B2B5Rare1Unlikely2Possible3Likely4Almost certain51Negligibleno treatment2Minorfirst aid3Moderatemedical treatment4Majorlost-time injury orseroconversion risk5Severefatality or permanentharmLIKELIHOOD →IMPACT →R1residual position (after controls)R1inherent positioneffect of existing controlsappetite boundary · red ring = above it25L×I score and rating bandRISK PROFILE BY BANDInherentResidual (current)Critical0 → 0High4 → 0Medium5 → 3Low0 → 6Low 1–4 · Medium 5–9 · High 10–16 · Critical 20–25EXPOSURE Σ L×I40residual, after current controlsfrom 87 inherent · −54%HIGHEST RESIDUAL RISKB1Needlestick with lentiviral vector duringanimal injection6 · Mediumowner Facility ManagerRISK APPETITEMedium or belowEvery risk is within appetiteRisk register9 risks · sorted by residual rating, then score#IDRISK, CONTROLS AND ACTIONSOWNERINHERENTRESIDUALCHANGEBIOLOGICALNeedlestick with lentiviral vector during animal injectionSafety-engineered needles and a no-resheathing ruleSharps bins at the point of useOccupational health post-exposure protocol1B1Facility Manager3 × 412 · High2 × 36 · Medium−6−50%ERGONOMICRepetitive strain from manual pipettingElectronic pipettes and task rotation every 90 minutes2B5Facility Manager4 × 28 · Medium3 × 26 · Medium−2−25%PHYSICALAsphyxiation in the liquid nitrogen cryostoreOxygen-depletion monitor alarming at 19.5%No lone working in the cryostore3B3Facility Manager2 × 510 · High1 × 55 · Medium−5−50%BIOLOGICALAerosol release from a failed centrifuge tubeSealed safety cups opened only inside the microbiological safety cabinet4B2Biological SafetyOfficer3 × 412 · High1 × 44 · Low−8−67%CHEMICALHydrofluoric acid burn during glass etchingHF-specific SOP with calcium gluconate gel at the benchDouble nitrile and neoprene gloves with a face shield5B4Chemical SafetyOfficer2 × 510 · High1 × 44 · Low−6−60%BIOLOGICALSafety cabinet airflow failure goes unnoticedAirflow alarm and annual KI-discus containment test6B9Facility Manager2 × 48 · Medium1 × 44 · Low−4−50%BIOLOGICALVector stock spilled outside the safety cabinetSpill kits with 1% Virkon and annual spill drills7B6Biological SafetyOfficer3 × 39 · Medium2 × 24 · Low−5−56%CHEMICALFormaldehyde exposure during tissue fixationFixation only in a ducted fume hoodAnnual personal exposure monitoring8B7Chemical SafetyOfficer3 × 39 · Medium2 × 24 · Low−5−56%BIOLOGICALAutoclave cycle fails to inactivate wasteWeekly biological indicators and a chart recorder on every cycle9B8Biological SafetyOfficer3 × 39 · Medium1 × 33 · Low−6−67%FINDINGS9 risks rated — inherent 4 High, 5 Medium; after current controls 3 Medium, 6 Low.Total exposure Σ(L×I) falls from 87 to 40 after current controls — a 54% reduction.Controls move 8 of 9 assessed risks into a lower band; 1 keeps its inherent band.Every risk sits within the Medium appetite on its residual rating.Highest residual risk: B1 Needlestick with lentiviral vector during animal injection — Medium 6, owner Facility Manager.Controls do most for B2: 12 → 4 (−67%).Illustrative assessment for a fictional facility; ratings are examples for training, not a local risk assessment.

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title "Viral vector core facility — BSL-2 laboratory risk assessment"
subtitle "Lentiviral vector production and in-vivo work · biological, chemical and physical hazards"
likelihood-levels: Rare, Unlikely, Possible, Likely, Almost certain
impact-levels: Negligible (no treatment), Minor (first aid), Moderate (medical treatment), Major (lost-time injury or seroconversion risk), Severe (fatality or permanent harm)
thresholds: 4, 9, 16
appetite: Medium
note "Illustrative assessment for a fictional facility; ratings are examples for training, not a local risk assessment."

risk B1 "Needlestick with lentiviral vector during animal injection"
  category: Biological
  owner: Facility Manager
  likelihood: 3
  impact: 4
  control "Safety-engineered needles and a no-resheathing rule"
  control "Sharps bins at the point of use"
  control "Occupational health post-exposure protocol"
  residual: 2x3

risk B2 "Aerosol release from a failed centrifuge tube"
  category: Biological
  owner: Biological Safety Officer
  likelihood: 3
  impact: 4
  control "Sealed safety cups opened only inside the microbiological safety cabinet"
  residual: 1x4

risk B3 "Asphyxiation in the liquid nitrogen cryostore"
  category: Physical
  owner: Facility Manager
  likelihood: 2
  impact: 5
  control "Oxygen-depletion monitor alarming at 19.5%"
  control "No lone working in the cryostore"
  residual: 1x5

risk B4 "Hydrofluoric acid burn during glass etching"
  category: Chemical
  owner: Chemical Safety Officer
  likelihood: 2
  impact: 5
  control "HF-specific SOP with calcium gluconate gel at the bench"
  control "Double nitrile and neoprene gloves with a face shield"
  residual: 1x4

risk B5 "Repetitive strain from manual pipetting"
  category: Ergonomic
  owner: Facility Manager
  likelihood: 4
  impact: 2
  control "Electronic pipettes and task rotation every 90 minutes"
  residual: 3x2

risk B6 "Vector stock spilled outside the safety cabinet"
  category: Biological
  owner: Biological Safety Officer
  likelihood: 3
  impact: 3
  control "Spill kits with 1% Virkon and annual spill drills"
  residual: 2x2

risk B7 "Formaldehyde exposure during tissue fixation"
  category: Chemical
  owner: Chemical Safety Officer
  likelihood: 3
  impact: 3
  control "Fixation only in a ducted fume hood"
  control "Annual personal exposure monitoring"
  residual: 2x2

risk B8 "Autoclave cycle fails to inactivate waste"
  category: Biological
  owner: Biological Safety Officer
  likelihood: 3
  impact: 3
  control "Weekly biological indicators and a chart recorder on every cycle"
  residual: 1x3

risk B9 "Safety cabinet airflow failure goes unnoticed"
  category: Biological
  owner: Facility Manager
  likelihood: 2
  impact: 4
  control "Airflow alarm and annual KI-discus containment test"
  residual: 1x4