Palintest Hydrosense Legionella Rapid Test Kit

Overview

The Palintest Hydrosense Legionella Rapid Test Kit is a field-deployable, lateral flow immunoassay designed for the qualitative detection of Legionella pneumophila serogroup 1—the predominant cause of Legionnaires’ disease—in water samples. Engineered for precision and operational simplicity, Hydrosense employs colloidal gold-conjugated monoclonal antibodies targeting the lipopolysaccharide (LPS) antigen specific to viable L. pneumophila SG1. Unlike culture-based methods reliant on bacterial replication, this immunochromatographic assay detects intact surface antigens, enabling identification of both culturable and viable-but-non-culturable (VBNC) cells—a critical capability in environmental risk assessment where traditional plating fails to capture metabolically active, non-replicating pathogens. The assay delivers results within 25 minutes post-sample preparation, eliminating dependency on centralized laboratories and supporting real-time decision-making in HVAC, cooling tower, hot water system, and spa facility management.

Key Features

• 25-minute total assay time—from sample collection to visual result interpretation—without instrumentation or power supply.
• Detection of Legionella pneumophila serogroup 1 in both culturable and VBNC physiological states, addressing a well-documented limitation of ISO 11731-compliant culture methods.
• No requirement for enrichment, incubation, or colony isolation; compatible with direct testing of swab eluates and membrane-filtered water concentrates.
• Validated against DB/T 485–2020 (China), aligning with national technical specifications for rapid legionella detection in domestic and industrial water systems.
• Compliant with UK Health and Safety Executive (HSE) guidance HSG274 Part 2 for legionella control in evaporative cooling systems and hot/cold water services.
• Robust architecture: lyophilized reagents ensure stability at ambient temperatures (15–30 °C); shelf life ≥18 months unopened.

Sample Compatibility & Compliance

Hydrosense accepts multiple sample types—including filtered water (100 mL volume, 0.22 µm filtration), swab eluates from showerheads, faucets, and tank interiors, and syringe-aspirated samples from pipe junctions or sump basins. It demonstrates >80% analytical recovery across matrix types (tap water, chlorinated pool water, biofilm-laden condensate) when spiked with L. pneumophila SG1 at concentrations ≥100 CFU/L. The method does not cross-react with Pseudomonas aeruginosa, Escherichia coli, or other common waterborne Gram-negative bacteria. While not intended for quantitative reporting, its qualitative output supports tiered monitoring strategies compliant with ISO 14698-1 (biocontamination control) and EU Directive 2009/128/EC (integrated pest management frameworks). All test cassettes carry CE marking under IVDR Class B (in vitro diagnostic regulation).

Software & Data Management

As a non-instrumented, visual-read assay, Hydrosense requires no proprietary software, drivers, or digital infrastructure. However, result documentation integrates seamlessly into enterprise environmental monitoring platforms via standardized data entry protocols. Laboratories and facility managers may log outcomes—including sample ID, location, date/time, operator, and pass/fail designation—into LIMS or CMMS systems compliant with ISO/IEC 17025:2017 and FDA 21 CFR Part 11 (when paired with electronic signature-enabled workflows). Batch-specific certificate of analysis (CoA) and lot traceability records are provided with each kit shipment, supporting GLP-aligned audit readiness.

Applications

• Routine surveillance of potable water systems in hospitals, hotels, and aged-care facilities per ASHRAE Guideline 12–2020.
• Emergency response screening following suspected exposure events or after system maintenance (e.g., descaling, filter replacement).
• Verification testing post-shock chlorination or thermal disinfection cycles.
• Pre-commissioning validation of newly installed plumbing networks or cooling circuits.
• Contractor-led compliance checks aligned with local public health ordinances requiring quarterly or biannual legionella monitoring.

FAQ

Does Hydrosense detect all Legionella species?
No. It is specifically validated for Legionella pneumophila serogroup 1, responsible for >84% of clinically reported Legionnaires’ disease cases globally.
Can it replace ISO 11731 culture testing for regulatory reporting?
Not universally. While accepted as a screening tool under DB/T 485–2020 and UK HSE protocols, confirmatory culture remains mandatory for positive results in most regulatory jurisdictions.
What is the lowest detectable concentration?
The limit of detection (LoD) is 100 CFU/L in water matrices following standard 0.22 µm filtration and 100 mL volume concentration.
Is training required to perform the test?
Minimal competency-based training is recommended. A certified user can achieve ≥95% inter-operator concordance after one supervised practice session using control materials.
How should negative results be interpreted in high-risk systems?
A negative result indicates absence of detectable L. pneumophila SG1 antigen above LoD—not absolute sterility. Risk mitigation must still follow engineering and operational controls outlined in CIBSE TM13 and BS 7592.