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Build rabies diagnostic capacity as a tiered, connected laboratory system—not as a single laboratory purchase. Start by assessing existing human and animal-health sites, then assign each site a defined role, select methods that match its infrastructure and biosafety assessment, train and retain staff, establish a safe specimen pathway, and connect peripheral services to a reference laboratory for confirmation and quality support.
Clinical signs alone cannot reliably distinguish rabies from other neurological infections. A functioning program therefore has to deliver dependable laboratory results, not merely rapid screening. The practical design is country-specific: national authorities must set the testing algorithm, transport rules, biosafety procedures, staffing model, procurement requirements and referral arrangements.
What laboratory capacity must deliver
Rabies diagnosis is a service chain. The test performed at the bench is only one link. Capacity is useful when a suspected human or animal case can be identified, a suitable specimen can be collected safely, transported under the applicable national rules, tested by a competent laboratory, referred when the result is inconclusive, and reported promptly to the people responsible for public-health and veterinary action.
WOAH’s 2025 field-test overview stresses that confirmatory laboratory diagnosis is essential. A clinical impression cannot substitute for laboratory evidence because rabies may resemble other neurological diseases. The network should therefore define where specimens enter the system, which laboratory performs the primary test, where confirmation occurs, and how results move back to clinicians, veterinary services and public-health decision-makers.
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Think of capacity at three levels, even if a country uses different names:
- Peripheral or collection sites: recognize suspect cases, collect or arrange collection of specimens, package them safely, document the case and send the material through the approved route.
- Testing laboratories: perform the assay assigned to their tier, apply the relevant quality controls, record the result and refer material that is outside their scope or produces an inconclusive finding.
- Reference laboratories: provide confirmation, specialized testing, training, external quality support, troubleshooting and national surveillance coordination.
The tiers are functional, not a prescription to equip every site with every assay. A small number of competent laboratories linked by a reliable specimen and reporting network can provide more dependable coverage than many under-equipped laboratories working in isolation.
Step 1: assess the existing network before buying equipment
Begin with structured site assessments. WHO’s International Health Regulations benchmark materials emphasize assessment visits and capacity plans because procurement without a baseline often leaves equipment unused, reagents unavailable or staff unable to interpret results.
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List public-health, veterinary, university and other laboratories that may handle rabies specimens. Record each site’s legal mandate, geographic catchment, opening hours, current services and authority to issue results. Include laboratories that already receive brain specimens even if they do not currently test them.
Document workforce and workload
For each site, record the number of staff who could be trained, their existing microscopy or molecular experience, supervisory arrangements, turnover and access to refresher training. Capture current and expected specimen volumes, the proportion referred elsewhere and the time from collection to result. The assessment should reveal whether the main constraint is testing capacity, specimen access, transport, interpretation, reporting or all of these.
Check infrastructure and biosafety
Review the laboratory space, electrical reliability, water and waste arrangements, equipment condition, maintenance support, reagent storage and data connectivity. Assess the complete workflow rather than one instrument: sample receipt, preparation, testing, decontamination, waste disposal and result reporting. WOAH’s terrestrial manual states: “Laboratories should follow appropriate biosafety and containment procedures as determined by biorisk analysis.” The assessment should therefore identify hazards and controls before an assay is selected.
Trace the specimen and information routes
Follow a specimen from the field to the testing laboratory and back to the decision-maker. Note who collects it, who packages it, how it is stored, which courier or transport service carries it, how receipt is confirmed and how the result is communicated. Map human-health and veterinary reporting channels together; rabies control depends on information crossing both sectors.
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Set measurable capacity goals
Use the baseline to define what each tier must be able to do. Goals might include a specified geographic referral route, a defined primary assay, a maximum locally agreed turnaround, a documented process for inconclusive results, trained backup personnel and a functioning data system. Do not use an assumed global minimum volume or staffing ratio: no universal figure has been established, so targets must reflect the country’s workload and risk.
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Step 2: assign a tiered diagnostic algorithm
The national algorithm should answer five questions for every specimen:
- Which site or professional is responsible for safe collection?
- Which laboratory performs the first laboratory test?
- What happens when the specimen is unsuitable, the result is invalid or the interpretation is inconclusive?
- Which laboratory provides confirmation or reference testing?
- Who receives and acts on the result, and within what locally defined timeframe?
Align the algorithm with national authorities and current WHO and WOAH guidance. A peripheral laboratory may be assigned a decentralized assay, while a regional or national laboratory retains confirmatory functions. The algorithm must explicitly define the referral pathway so that a negative, positive, invalid or inconclusive result has the same meaning across the network.
Where a site lacks a fluorescence microscope, the answer is not automatically to use an unvalidated rapid test. The country can consider a decentralized method such as dRIT, subject to local validation, training, reagent supply, quality oversight and a confirmation pathway. Alternatively, the site may remain a collection and referral point. The correct choice depends on the assessment and the algorithm, not on the absence of one instrument alone.
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Step 3: choose methods against the network’s real constraints
The principal options described by WHO and WOAH have different infrastructure and competency requirements. Method selection should be made after the tiering exercise, not before it.
| Method | Role supported by current guidance | Core requirements | Important implementation constraints |
|---|---|---|---|
| Fluorescent antibody test (FAT), also called direct fluorescent antibody testing or DFA | WHO identifies it as the gold-standard post-mortem antigen-detection method. | An appropriate fluorescence microscope, good-quality conjugated antiserum or globulin, trained personnel and suitable quality procedures. | Requires dependable microscopy infrastructure, reagent quality and supply, competent interpretation, adequate specimens and ongoing maintenance. |
| Direct rapid immunohistochemistry (dRIT) | WHO recommends further development for decentralized laboratory-based surveillance; it has been implemented after training in Benin. | Method-specific reagents, trained staff, documented interpretation, local validation and supervisory oversight. | It is not automatically interchangeable with FAT. The algorithm must define confirmation, referral and quality-assurance arrangements. |
| Pan-lyssavirus RT-PCR | WOAH lists it among primary agent-detection approaches. | Molecular laboratory infrastructure, contamination control, trained personnel, suitable reagents and a maintenance and quality system. | Requires a realistic supply chain and a clear confirmation or referral pathway within the national algorithm. |
FAT/DFA: the reference post-mortem antigen method
WHO describes FAT as the gold-standard post-mortem antigen-detection method. It is not simply a matter of owning a microscope. WHO states: “Apart from an appropriate microscope, the two main requirements for success in using this technique are well trained personnel and conjugated antiserum or globulin of good quality.” Those three elements—fit-for-purpose equipment, competent interpretation and reliable conjugated reagent—must be planned together.
Procurement specifications should identify an appropriate fluorescence microscope rather than assuming that a general-purpose or consumer microscope can support diagnostic reporting. The laboratory also needs a reagent supply plan, maintenance arrangements, a way to document competency and procedures for managing poor-quality or inadequate specimens. Power reliability and technical support belong in the same decision because an assay cannot remain dependable if the microscope or supporting equipment is intermittently unavailable.
dRIT: a possible decentralized option
WHO recommends further development of dRIT as an alternative for decentralized laboratory-based surveillance. The recommendation does not make dRIT universally interchangeable with FAT. Before assigning dRIT to a site, the program should establish the method’s local validation and oversight, train staff in staining and interpretation, define reagent replenishment and document how positive, negative and inconclusive results are confirmed or referred.
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dRIT can be considered where a network needs laboratory-based testing closer to the point of specimen collection, but the decision should follow the country’s diagnostic algorithm and biorisk assessment. A lower equipment burden, if demonstrated locally, does not remove the need for competent staff, quality controls, supervision and a functioning referral link.
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Pan-lyssavirus RT-PCR: molecular capacity with network implications
WOAH lists pan-lyssavirus RT-PCR as a primary agent-detection approach. A laboratory considering it must assess molecular workspace, contamination control, staff competence, reagent supply and equipment maintenance. The method’s value depends on the entire workflow: specimen receipt and preparation, assay controls, result interpretation, data recording and access to a reference laboratory when confirmation or troubleshooting is required.
RT-PCR should not be introduced as a stand-alone instrument purchase. The national algorithm must specify which laboratory is authorized to report, how unexpected or inconclusive findings are handled and how the laboratory receives technical support.
Why lateral-flow tests are not a substitute for confirmation
WOAH’s RABLAB field-test overview emphasizes the need for confirmatory laboratory diagnosis. A lateral-flow test should therefore not replace the designated confirmatory method in the national algorithm. If a rapid test is used for an operational purpose, its role, limitations, referral requirements and interpretation must be explicitly defined by national authorities.
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Training should cover the entire assigned workflow, not just the staining or amplification step. A competency package should include:
- the selected assay and its controls;
- interpretation of expected, weak, invalid and inconclusive results;
- safe specimen receipt and handling;
- waste management and incident response;
- documentation, result authorization and reporting;
- referral decisions and communication with the reference laboratory.
Use supervised practice, competency checks and documented authorization before a staff member reports results independently. Plan for turnover by training more than one person where feasible, maintaining a competency register and arranging mentoring from a higher-tier laboratory. Refresher training should be triggered by assay changes, recurrent errors, quality findings or long periods without testing—not only by a calendar date.
The Benin implementation illustrates the scale of a focused training intervention: five local diagnosticians attended a three-day dRIT workshop in 2018. The workshop also addressed safe brain-sample collection. This is an example of a country-specific implementation, not a universal staffing or training standard.
Step 5: procure against a validated workflow
Prepare an assay-specific bill of materials only after the tier, method and workflow have been approved. Include the equipment, method-specific reagents, controls, consumables, storage requirements, maintenance, calibration or verification needs, waste arrangements and backup plan. A procurement list that names only the primary instrument will not sustain testing.
Plan reagent continuity
Conjugated antisera or globulin for FAT must be good quality, and every method depends on reliable reagent availability. Establish who forecasts demand, who approves substitutions, how lots are received and checked, how stock is monitored and what happens when a shipment is delayed. Keep a documented escalation route to the reference laboratory for reagent or interpretation problems.
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Match equipment to the assigned tier
Do not attempt to equip every site for every assay. A peripheral site may need safe collection, packaging and referral capability, while a regional laboratory receives the equipment and staff development required for its assigned method. For FAT, specify an appropriate fluorescence microscope and the supporting infrastructure required for diagnostic use; do not assume that a general-purpose consumer microscope is adequate.
Include maintenance and power resilience
Budget for preventive maintenance, repairs, spare parts, service contracts where available and a documented response when equipment fails. Assess electrical reliability and the effect of interruptions on the selected workflow. A site that cannot keep its equipment operational should have a defined referral route rather than silently accumulating untested specimens.
Apply the biorisk assessment to procurement and layout
Containment, personal protective measures, waste handling and workflow separation should follow the laboratory’s biorisk analysis and national requirements. The WOAH manual’s instruction is explicit: “Laboratories should follow appropriate biosafety and containment procedures as determined by biorisk analysis.” Procurement and renovation decisions should be traceable to that assessment.
Step 6: establish the specimen pathway
Specimen systems are part of diagnostic capacity. Training only the laboratory staff leaves a predictable failure point in the field. Assign responsibility at every handoff and provide job aids for collectors, packers, storage personnel, couriers and receiving staff.
- Recognize and notify: define who identifies a suspect case and how the laboratory or surveillance unit is informed.
- Collect safely: train the relevant personnel in the approved collection procedure for the specimen required by the national algorithm. Brain-sample collection was included in the Benin training intervention.
- Package and label: use the national packaging, labeling and documentation requirements. The package should remain traceable to the case and the requesting service.
- Store and transport: specify the permitted storage conditions, handoff records, transport route and escalation procedure for delay. Follow national rules and the site’s biorisk assessment.
- Receive and triage: document receipt, verify the accompanying information and route the specimen to the assigned assay or reference laboratory. Any decision to refer, hold or request clarification should be recorded.
- Report and close the loop: send the authorized result to the designated clinical, veterinary and public-health recipients, and record referrals, final interpretations and corrective actions.
Write the pathway as an SOP that names people or roles, not vague departments. It should state who is called when transport fails, when a specimen cannot be tested locally or when the result is inconclusive. The exact packaging and transport rules must come from national requirements; they should not be improvised from a generic checklist.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Step 7: make quality assurance and data systems routine
A laboratory becomes a service only when it can demonstrate that its results are controlled and traceable. Establish SOPs for the assigned assay, specimen handling, equipment operation, reporting, referral and incident management. Keep current versions accessible at the point of work.
Internal quality controls and external comparison
Use internal controls and quality checks appropriate to the method and national guidance. Arrange external quality assessment or proficiency activities where available and appropriate. Review failures with the reference laboratory, document corrective actions and verify that the action solved the problem.
Monitor the indicators that reveal service failure
Track staff competency, reagent availability, equipment maintenance, specimen referrals, invalid or inconclusive results and corrective actions. Add the locally agreed turnaround measure and the completeness of result reporting. These indicators distinguish a laboratory that occasionally produces a result from one that can provide a dependable public-health service.
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Use a laboratory information system or equivalent register
WHO benchmark materials support laboratory information systems and network information flows. At minimum, the system should preserve the link between the specimen, submitting service, test performed, result, referral and final report. Access controls and backup procedures should reflect national policy. If a full laboratory information system is not yet feasible, use a controlled register that can be reconciled with surveillance data and upgraded later.
Step 8: connect laboratories and decision-makers
Maintain a named reference-laboratory contact pathway for technical advice, confirmation, reagent or equipment problems and unusual results. Schedule mentoring and review visits rather than waiting for a crisis. Reporting should move in both directions: peripheral and regional laboratories need timely feedback, while national programs need aggregate information on workload, turnaround, invalid results and gaps.
Rabies is a One Health problem, so veterinary and public-health laboratories should share the parts of the network that affect diagnosis and response. WOAH established the RABLAB network in May 2021 to support standardization, collaboration and training. Its model illustrates why laboratories should not operate as isolated units: shared procedures, technical exchange and reference support improve consistency across sites.
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A peer-reviewed report from the Central Veterinary Laboratory in Parakou describes a practical capacity-building sequence. Following an assessment, the laboratory hosted a dRIT workshop in 2018. Five local diagnosticians attended the three-day course, which included safe brain-sample collection. The team also established a rabies diagnosis database.
The report says that the laboratory tested 61 samples over approximately three years and that more than 40% were positive. These are descriptive figures from one laboratory and one implementation context. They are not a prevalence estimate for Benin, a forecast of expected workload elsewhere or a universal threshold for deciding whether to establish a testing service. The transferable lesson is the combination of assessment, assay training, specimen training and data capture.
Budgeting, continuity and limits of the evidence
There is no generalizable global cost, universal staffing ratio or minimum specimen volume that can be applied to every low-resource setting. Build the budget from the approved workflow and tiering decision. Cost categories normally follow the service chain: assay-specific equipment and reagents, storage, maintenance, staff training and mentoring, specimen collection and transport, quality activities, data management and reference-laboratory support. National procurement rules and local prices determine the actual amounts.
Recurrent costs deserve as much attention as initial purchases. A fluorescence microscope without a reagent supply plan, a molecular platform without contamination-control procedures or trained staff, or a decentralized assay without a confirmation route does not create durable capacity. Include replacement, repair, refresher training, proficiency activities and transport continuity in the operating plan.
Guidance changes. WHO’s laboratory handbook volumes date from 2018–2019, while WOAH’s field-test overview is dated 1 August 2025. Before operational use, national authorities should recheck current WHO and WOAH guidance, national biosafety and transport rules, and the latest approved diagnostic algorithm. The framework here is global guidance, not a country-specific implementation plan.
What a complete launch decision should document
Before a site begins reporting, the program should have a written record of:
- the site’s tier, mandate and geographic coverage;
- the assay it is authorized to perform and the reference method or laboratory;
- trained and authorized personnel, including backup coverage;
- equipment, reagent and maintenance arrangements;
- the biorisk assessment and applicable containment procedures;
- specimen collection, packaging, storage, transport and referral SOPs;
- internal quality controls and external assessment arrangements;
- the reporting recipients, data system and escalation contacts;
- the indicators used to review competency, supply, maintenance, invalid results and corrective actions.
That documentation turns a laboratory purchase into a connected diagnostic service. The strongest design is not the one with the most instruments; it is the one that can safely receive a specimen, produce a defensible result or refer it appropriately, and move that result quickly to the people who must act.
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