LiveAttenuatedVaccineGeneticStability_QualityChecker

Live Attenuated Vaccine Genetic Stability

Huvac human vaccines vaccination adjuvants mRNA vaccines sterility endotoxins cold chain

Utility description: Live Attenuated Vaccine Genetic Stability

Live Attenuated Vaccine Genetic Stability Quality Checker — Control of Genetic Stability of Live Attenuated Vaccines

ℹ️ Utility analyzes sequencing data (NGS/Sanger) to confirm genetic stability of live attenuated vaccines according to WHO and Ph. Eur. 5.2.14:
• Sequence Identity: Comparison with Master Seed reference genome.
• Attenuation Markers: Verification of specific mutations ensuring virus attenuation.
• Reversion to Virulence: Strict control for absence of back-mutations restoring pathogenicity.
• Data Quality: Coverage Depth control for variant calling reliability.
• Genetic Drift: Assessment of total accumulated mutations.

⚠️ CRITICAL:
• Detection of Reversion Markers means the virus may revert to wild type and cause disease.
• Loss of even one key attenuation mutation renders the batch defective and dangerous.

Usage:
LiveAttenuatedVaccineGeneticStabilityQualityChecker.exe → demo mode (console output)
LiveAttenuatedVaccineGeneticStabilityQualityChecker.exe input.csv output.json → evaluate your data

Input format:
BatchNumber,ProductName,VirusStrain,SequenceIdentity_Percent,MutationsInAttenuationSites,TotalMutations_vs_MasterSeed,CoverageDepth_X,ReversionMarkersDetected,PassageNumber

Example:
GEN-STAB-001,OPV Type 2,Sabin 2,99.95,3,5,500.0,None,40

— WHY IS THIS NEEDED?
Live vaccines contain replicating virus. During production (cell passages), the virus evolves.
It is critical to ensure it has not "corrected" the mutations that made it safe (attenuated).
Genetic stability is the foundation of live vaccine safety (OPV, MMR, Varicella, Yellow Fever).

⚠️ CRITICAL:
• Master Seed System: All comparisons are made against the approved Master Seed Virus.
• Attenuation Sites: Each virus has a known set of nucleotides/amino acids responsible for attenuation (e.g., positions 481, 744, 2493 for Sabin poliovirus).
• Reversion: Even single cases of reversion in the viral population (quasispecies) can be dangerous for immunocompromised patients.
• NGS vs Sanger: NGS is preferred as it allows detection of minor variants (low-frequency mutations) that Sanger might miss.

Key features:
• Automatic check of key attenuation sites
• Detection of reversion to virulence markers
• Sequencing quality control (Coverage)
• Overall genetic drift assessment
• Generation of reports for regulatory dossiers and LIMS LabWare
• Compliance with WHO TRS and Ph. Eur. requirements

Critical parameters:
• Identity: ≥ 99.9%
• Attenuation Mutations: Strict match to reference
• Reversion Markers: Absent (None)
• Coverage: ≥ 100x (for NGS)
• Total Mutations: Minimal count (virus-dependent)

💡 Usage tips:
1. Bioinformatics: Use validated pipelines for read alignment and variant calling.
2. Reference: Ensure current Master Seed sequence is used, not just wild type from GenBank.
3. Quasispecies: Analyze not only consensus sequence but also allele frequency to detect emerging reversion.
4. Passages: Higher passage number of production strain increases mutation risk. Control is mandatory at each stage.
5. Interpretation: Not all mutations are dangerous. Synonymous substitutions are often neutral. Focus on non-synonymous substitutions in structural proteins.

⚠️ Note: For some viruses (e.g., influenza), genetic variability is high, and stability criteria focus on specific hemagglutinin and neuraminidase genes rather than the whole genome.

input.csv

BatchNumber,ProductName,VirusStrain,SequenceIdentity_Percent,MutationsInAttenuationSites,TotalMutations_vs_MasterSeed,CoverageDepth_X,ReversionMarkersDetected,PassageNumber
GEN-STAB-OPV-001,Oral Polio Vaccine Type 2,Sabin 2,99.95,3,5,500.0,None,40
GEN-STAB-MMR-002,Measles Vaccine,Edmonston-Zagreb,99.98,2,3,300.0,None,35
GEN-FAIL-REV-003,Varicella Vaccine,Oka Strain,99.90,1,12,450.0,ORF62_Reversion,42

URS & FS — User Requirements and Functional Specification

This document describes the controlled interface and behaviour of LiveAttenuatedVaccineGeneticStability_QualityChecker for Live Attenuated Vaccine Genetic Stability Quality Checker.

Domain limits URS input.csv FS IQ/OQ/PQ

Domain limits and critical parameters

Key fragments from the source description are shown below. Before production use, limits must be verified against the approved specification, registration dossier and local SOPs.

ℹ️ Utility analyzes sequencing data (NGS/Sanger) to confirm genetic stability of live attenuated vaccines according to WHO and Ph. Eur. 5.2.14:
• Sequence Identity: Comparison with Master Seed reference genome.
⚠️ CRITICAL:
It is critical to ensure it has not "corrected" the mutations that made it safe (attenuated).
• Master Seed System: All comparisons are made against the approved Master Seed Virus.
• Compliance with WHO TRS and Ph. Eur. requirements
Critical parameters:
• Identity: ≥ 99.9%
• Coverage: ≥ 100x (for NGS)
⚠️ Note: For some viruses (e.g., influenza), genetic variability is high, and stability criteria focus on specific hemagglutinin and neuraminidase genes rather than the whole genome.

URS — User Requirements Specification

ID	Requirement	Criticality	Acceptance criterion
URS-001	The utility shall accept an input.csv file for Live Attenuated Vaccine Genetic Stability Quality Checker with headers defined in the data contract.	High	The file is processed without manual header editing.
URS-002	The utility shall perform deterministic QC evaluation without machine learning and without probabilistic conformance decisions.	High	Identical input data, rule version and configuration produce reproducible results.
URS-003	The utility shall validate mandatory fields, data types, ranges, units and domain plausibility.	High	Schema, conversion and range errors are explicitly reported.
URS-004	The utility shall apply domain limits and rules from the description, approved specification, registration dossier and local SOPs.	High	Each check has PASS/WARNING/FAIL and a clear message.
URS-005	The utility shall generate output.json with machine-readable results, source values, warnings, failures and critical findings.	High	JSON is suitable for LIMS/ELN/MES integration and QA/QC review.
URS-006	The utility shall preserve traceability between batch/sample, input file, applied rules and final status.	High	Output contains identifiers, checked parameters and audit metadata.
URS-007	The documentation shall support IQ/OQ/PQ, CSV/CSA and review by internal QA or inspectors.	Medium	URS, FS, input/output contract and test scenarios are supplied with the utility.
URS-008	The utility shall be used as a QC decision-support tool and not as a substitute for approved specifications and QA/QP release decision.	Medium	Documentation states change control and limit-verification expectations.

input.csv contract

#	Field	Type	Sample	Purpose
1	`BatchNumber`	string / controlled vocabulary	`GEN-STAB-OPV-001`	Batch or lot identifier used for traceability.
2	`ProductName`	string / controlled vocabulary	`Oral Polio Vaccine Type 2`	Product or dosage-form name under evaluation.
3	`VirusStrain`	string / controlled vocabulary	`Sabin 2`	Controlled input parameter for deterministic QC rules.
4	`SequenceIdentity_Percent`	decimal	`99.95`	Controlled input parameter for deterministic QC rules.
5	`MutationsInAttenuationSites`	decimal	`3`	Controlled input parameter for deterministic QC rules.
6	`TotalMutations_vs_MasterSeed`	decimal	`5`	Controlled input parameter for deterministic QC rules.
7	`CoverageDepth_X`	decimal	`500.0`	Controlled input parameter for deterministic QC rules.
8	`ReversionMarkersDetected`	string / controlled vocabulary	`None`	Controlled input parameter for deterministic QC rules.
9	`PassageNumber`	integer / decimal	`40`	Controlled input parameter for deterministic QC rules.

BatchNumber,ProductName,VirusStrain,SequenceIdentity_Percent,MutationsInAttenuationSites,TotalMutations_vs_MasterSeed,CoverageDepth_X,ReversionMarkersDetected,PassageNumber
GEN-STAB-OPV-001,Oral Polio Vaccine Type 2,Sabin 2,99.95,3,5,500.0,None,40
GEN-STAB-MMR-002,Measles Vaccine,Edmonston-Zagreb,99.98,2,3,300.0,None,35
GEN-FAIL-REV-003,Varicella Vaccine,Oka Strain,99.90,1,12,450.0,ORF62_Reversion,42

Input validation rules

ID	Field	Rule	Criticality
VR-001	`BatchNumber`	The field shall match an approved dictionary or accepted string representation.	High
VR-002	`ProductName`	The field shall match an approved dictionary or accepted string representation.	High
VR-003	`VirusStrain`	The field shall match an approved dictionary or accepted string representation.	High
VR-004	`SequenceIdentity_Percent`	The field shall match an approved dictionary or accepted string representation.	Medium
VR-005	`MutationsInAttenuationSites`	The field shall match an approved dictionary or accepted string representation.	Medium
VR-006	`TotalMutations_vs_MasterSeed`	The field shall match an approved dictionary or accepted string representation.	Medium
VR-007	`CoverageDepth_X`	The field shall match an approved dictionary or accepted string representation.	Medium
VR-008	`ReversionMarkersDetected`	The field shall match an approved dictionary or accepted string representation.	Medium
VR-009	`PassageNumber`	The field shall match an approved dictionary or accepted string representation.	Medium

FS — Functional Specification

ID	Function	Implementation
FS-001	CLI execution	Support execution modes: demo mode without arguments and production mode input.csv output.json.
FS-002	CSV import	Read input.csv in UTF-8/CSV-compatible format and validate header and expected columns.
FS-003	Schema validation	Check mandatory fields, column count, unknown key fields and empty mandatory values.
FS-004	Type conversion	Convert numeric, flag and text values; invalid format is recorded as a row-level error.
FS-005	Domain rule engine	Apply rules for Live Attenuated Vaccine Genetic Stability Quality Checker, including critical limits from the description and approved specification.
FS-006	Status aggregation	Produce final status: FAIL for critical failure, WARNING for non-critical deviation, PASS for conformance.
FS-007	JSON export	Write output.json with detailed checks, source values, warnings, failures and critical findings.
FS-008	Audit support	Keep result structure suitable for review, deviation investigation and calculation reproduction.
FS-009	Integration contract	Support the scenario LIMS/ELN/MES → input.csv → utility → output.json → portal/admin review.
FS-010	Error handling	Return explicit messages for missing file, empty CSV, invalid schema, output write failure and invalid format.

Example output.json

{
  "utilityId": "liveattenuatedvaccinegeneticstability-qualitychecker",
  "utilityFolder": "LiveAttenuatedVaccineGeneticStability_QualityChecker",
  "package": "huvac",
  "overallStatus": "PASS|WARNING|FAIL",
  "sourceFile": "input.csv",
  "processedAtUtc": "2026-06-10T00:00:00Z",
  "checks": [
    {
      "parameter": "BatchNumber",
      "value": "GEN-STAB-OPV-001",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-001"
    },
    {
      "parameter": "ProductName",
      "value": "Oral Polio Vaccine Type 2",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-002"
    },
    {
      "parameter": "VirusStrain",
      "value": "Sabin 2",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-003"
    },
    {
      "parameter": "SequenceIdentity_Percent",
      "value": "99.95",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-004"
    },
    {
      "parameter": "MutationsInAttenuationSites",
      "value": "3",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-005"
    },
    {
      "parameter": "TotalMutations_vs_MasterSeed",
      "value": "5",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-006"
    },
    {
      "parameter": "CoverageDepth_X",
      "value": "500.0",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-007"
    },
    {
      "parameter": "ReversionMarkersDetected",
      "value": "None",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-008"
    },
    {
      "parameter": "PassageNumber",
      "value": "40",
      "status": "PASS|WARNING|FAIL",
      "message": "Deterministic rule-based check result",
      "ruleReference": "FS-RULE-009"
    }
  ],
  "criticalFindings": [],
  "warnings": [],
  "audit": {
    "inputHash": "sha256:<calculated at runtime>",
    "rulesVersion": "<utility executable version>",
    "documentation": "LiveAttenuatedVaccineGeneticStability_QualityChecker.documentation.html"
  }
}

Traceability matrix

URS	FS	Test	Evidence
URS-001	FS-001, FS-002	OQ-001	Verify execution and import of valid input.csv.
URS-002	FS-005, FS-006	OQ-004	Repeat the same dataset and compare output.json.
URS-003	FS-003, FS-004, FS-010	OQ-002, OQ-003	Verify missing columns and invalid types.
URS-004	FS-005, FS-006	OQ-004, PQ-001	Verify critical deviations on real/boundary data.
URS-005	FS-007, FS-009	OQ-005	Verify JSON schema and downstream-system suitability.
URS-006	FS-008	OQ-006	Verify identifiers and audit metadata.
URS-007	FS-008, FS-010	IQ-001, OQ-007	Verify documentation completeness and control evidence.
URS-008	FS-005, FS-008	PQ-002	Verify review workflow and no replacement of QA decision.

IQ/OQ/PQ test scenarios

ID	Scenario	Expected result
IQ-001	Verify executable, input.csv, documentation and checksum availability.	Delivery set is complete; version is recorded.
OQ-001	Valid sample row from input.csv.	PASS or acceptable WARNING according to rules.
OQ-002	Remove a mandatory CSV column.	Schema error or FAIL with missing-column reference.
OQ-003	Place a non-numeric value into a numeric field.	Type-conversion error with row/field reference.
OQ-004	Set a critical parameter outside the limit.	FAIL and critical finding.
OQ-005	Verify output.json structure.	All mandatory sections are present and JSON is valid.
OQ-006	Verify batch/sample traceability.	Input and result identifiers match.
PQ-001	Verify 3–5 real user batches/samples.	Result is confirmed by QC/QA review.
PQ-002	Verify deviation workflow and manual QA decision.	Utility supports review but does not replace approved decision.

QA/QC and change control

Do not rename columns without updating validator, documentation and test set.
Retain input.csv, output.json, executable version and checksum.
Before production use, perform IQ/OQ/PQ or equivalent CSV/CSA verification.
Critical limits shall be verified against the approved specification, registration dossier and local SOPs.
The utility provides structured QC decision support; final release decision remains with QA/QP and approved procedures.

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