One Health surveillance depends on a chain: field sampling, transport, and laboratory reception. The science inside the laboratory is rigorous. The biosafety before the sample reaches it often is not. This article examines the evidence for the biosafety gaps in the pre-analytical chain and where VHP decontamination fits.

The One Health framework, the integrated approach to health at the human–animal–environment interface, formalised through the WHO/FAO/WOAH tripartite partnership since 2022, has laboratory services as one of its six priority areas.¹ The rationale is straightforward: surveillance for zoonotic diseases, antimicrobial resistance, and food safety depends on the ability to collect, transport, and analyse biological specimens from field settings, animal populations, environmental reservoirs, and human communities, in laboratories equipped to handle them safely.

The biosafety infrastructure inside those laboratories, containment levels, biological safety cabinets, validated decontamination, is the subject of detailed international guidance (BMBL 6th edition, WHO LBM 4th edition, EN 12128). What receives substantially less systematic attention is the biosafety of the chain before the sample reaches the laboratory: the field collection, the primary packaging, the transport, and the reception and processing at the laboratory door. This pre-analytical chain is where the highest variability in biosafety practice occurs, and where the One Health surveillance system is most vulnerable to both operator exposure and sample integrity compromise.

The science inside the BSL-3 laboratory is rigorously controlled. The biosafety of the sample that arrives at its door often is not.

1. The Pre-Analytical Chain: Three Critical Points of Failure

The pre-analytical biosafety chain can be decomposed into three segments, each with distinct hazard profiles and regulatory frameworks:

1.1 Field Collection

Field sampling for One Health surveillance occurs in uncontrolled environments with variable biosafety infrastructure. The available PPE, primary containment, and surface decontamination capability vary widely between settings. For high-consequence zoonotic pathogens, such as H5N1, all reusable PPE and waste must be decontaminated after each use.^2,3 Between the field collection point and the BSL-3 laboratory, there is a gap: the surfaces, equipment, and packaging used in collection are potentially contaminated.

1.2 Transport

The transport of infectious substances is regulated by the UN Model Regulations (IATA P620/P650).⁴ The triple packaging system is designed to contain the specimen in transit, but it is not designed to address the contamination of the exterior surfaces of the primary or secondary packaging that may have occurred during field collection. This is a documented biosafety gap: the outer surface of a specimen tube handled in the field arrives at the laboratory as a potentially contaminated surface.

1.3 Laboratory Reception

The laboratory reception area is where the uncontrolled field chain meets the controlled laboratory environment. The WHO LBM 4th edition identifies specimen reception as a core requirement that must include provisions for decontamination of packaging surfaces.⁵ In practice, this zone often operates at a lower containment level (BSL-2) than the processing laboratory, creating an exposure risk if incoming packaging is contaminated.

2. The H5N1 Case Study: Field Biosafety Under Pressure

The ongoing panzootic of highly pathogenic avian influenza A(H5N1) illustrates the pre-analytical biosafety challenge. Surveillance requires field teams to collect swabs and milk samples from birds and cattle in environments where transmission through contact with contaminated environments has been documented.^2,6 A portable, rapid, non-toxic decontamination capability at the point of collection would materially reduce the biosafety gap in this chain.

3. Where VHP Fits in the One Health Surveillance Chain

3.1 Field Equipment Decontamination

Reusable field equipment requires decontamination after each use. Liquid chemical disinfectants are the current standard but have limitations in remote settings. The Delox Box, with its solid-state VHP generation, provides a portable, validated decontamination capability for small, enclosed spaces without water or liquid chemicals.

3.2 Mobile and Field Laboratory Decontamination

Mobile laboratories deployed for One Health surveillance require periodic decontamination of the entire space. The Delox Box provides a field-deployable VHP capability that does not depend on heavy infrastructure, making it ideal for terminal decontamination at deployment sites.

3.3 Specimen Reception Decontamination

VHP surface decontamination of specimen packaging and transport containers before they are opened in the reception area addresses the contamination gap that the triple packaging system does not cover. This is particularly relevant for high-risk specimens arriving from outbreak investigations.

4. Regulatory and Standards Framework for Field Biosafety

5. Conclusion

One Health surveillance is only as reliable as the weakest link in the chain. The pre-analytical chain has specific biosafety gaps that are addressed by standards in principle but inconsistently implemented. Vaporized hydrogen peroxide, delivered through the DeloxHP solid-state technology, provides a field-deployable, infrastructure-independent, validated decontamination capability that addresses these gaps, offering a solution designed for the operational realities of One Health surveillance.

Frequently Asked Questions

What are the biosafety requirements for field sampling in One Health surveillance?
Field sampling requires appropriate PPE, primary containment of specimens, and decontamination of reusable equipment and waste at the collection site. Pathogens like H5N1 require on-site decontamination of all reusable PPE and waste before disposal.^1,2

What is IATA Packing Instruction P650 and when does it apply?
IATA P650 specifies triple packaging requirements for Category B infectious substances (UN3373). It requires a leak-proof primary receptacle, secondary packaging with absorbent material, and a rigid outer packaging.⁴

How can VHP be used for decontamination in field settings?
The DeloxHP solid-state formulation generates VHP from a stable precursor without water or steam. The Delox Box device delivers validated decontamination for spaces up to 2 m³, making it suitable for field equipment and transport containers in remote locations.

Why is specimen reception a biosafety risk in One Health surveillance?
The reception zone is where field packaging is opened. If exterior surfaces are contaminated from field handling, opening them in a BSL-2 reception area creates an exposure risk before the specimen reaches the BSL-3 laboratory.⁵

References

1. WHO/FAO/WOAH Tripartite Zoonoses Guide (2019).
2. CDC guidance on handling specimens associated with H5N1.
3. WOAH Manual of Diagnostic Tests.
4. WHO Guidance on Regulations for the Transport of Infectious Substances.
5. WHO Laboratory Biosafety Manual. 4th ed.
6. Studies on H5N1 transmission and environmental contamination.