Zefon VIRA-PORE Airborne Viral Sampling System

Overview

The Zefon VIRA-PORE Airborne Viral Sampling System is an engineered solution for the collection and stabilization of airborne viral RNA from ambient and occupational air environments. It operates on the principle of active impaction—drawing air through a proprietary ZePore™ polytetrafluoroethylene (PTFE) membrane filter with precisely controlled pore geometry and surface chemistry. This design enables efficient physical retention of submicron bioaerosol particles—including enveloped and non-enveloped viruses—while minimizing nucleic acid degradation during sampling, transport, and pre-analytical storage. Unlike passive or gravitational samplers, the VIRA-PORE system delivers consistent volumetric airflow at calibrated rates (10 L/min for area monitoring; 3 L/min for personal exposure assessment), ensuring reproducible collection efficiency across variable environmental conditions. The system is intended for use in conjunction with validated downstream molecular workflows, particularly RT-qPCR assays targeting virus-specific genomic sequences.

Key Features

• ZePore™ PTFE membrane filter—validated for high-efficiency retention of viral particles ≥0.1 µm while preserving RNA integrity under standard shipping and storage conditions (2–8 °C or frozen)
• No pre-treatment required: sterile, ready-to-use configuration eliminates filter conditioning or chemical priming steps
• Single-use, disposable sampling cassette: eliminates cross-contamination risk and avoids labor-intensive decontamination protocols
• Universal pump compatibility: designed to interface with any 10 L/min vacuum-driven sampling pump (e.g., Zefon high-capacity diaphragm or rotary vane pumps) or 3 L/min personal sampling pumps (e.g., Zefon Escort ELF series)
• Modular mounting options: compatible with Zefon universal holder (ZA0061), tripod (ZA0042), and Luer-lock adapter (ZA0005) for flexible deployment in fixed-location or mobile monitoring scenarios
• Compliant with ISO 14698-1:2003 (Biocontamination control—Part 1: General principles and methods) for microbiological air sampling methodology

Sample Compatibility & Compliance

The VIRA-PORE system has been independently verified for recovery of viral RNA from model coronaviruses (e.g., HCoV-229E, MHV-A59) and influenza A (H1N1) under controlled aerosol challenge studies. While not specifically tested with SARS-CoV-2, its performance aligns with published filtration efficacy data for PTFE membranes against similar-sized enveloped virions. Users must adhere to applicable biosafety requirements per CDC/NIH Biosafety in Microbiological and Biomedical Laboratories (BMBL) 6th Edition and OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030). All handling, packaging, labeling, and transport must comply with IATA Dangerous Goods Regulations (DGR) Packing Instruction 650 and national regulations governing diagnostic specimens. Environmental Express recommends prior consultation with an accredited environmental virology laboratory to establish site-specific SOPs for safe sample handling, chain-of-custody documentation, and RNA extraction validation.

Software & Data Management

The VIRA-PORE is a hardware-only sampling device and does not incorporate embedded firmware, onboard data logging, or proprietary software. Sample volume tracking and flow calibration are performed externally using NIST-traceable flow meters (e.g., DryCal DC-Lite or Gilian Gilibrator-2) in accordance with ISO 17025-accredited procedures. For regulatory compliance in GLP/GMP environments, users are advised to integrate sampling events into electronic lab notebooks (ELNs) or LIMS platforms that support 21 CFR Part 11-compliant audit trails, user authentication, and electronic signature functionality. Calibration certificates, pump runtime logs, and environmental metadata (temperature, RH, sampling duration) must be retained for minimum 5 years per FDA guidance and ISO/IEC 17025:2017 clause 7.11.

Applications

• Indoor air quality (IAQ) surveillance in healthcare facilities, laboratories, and congregate settings
• Hospital infection prevention and control (IPC) programs—evaluating HVAC filtration efficacy and room decontamination endpoints
• Occupational health assessments for frontline workers exposed to aerosol-generating procedures
• Environmental validation of cleanrooms, isolation rooms, and negative-pressure enclosures
• Research applications in aerobiology, viral transmission dynamics, and antiviral surface efficacy testing

FAQ

Is the VIRA-PORE system validated for SARS-CoV-2 detection?
No. While the ZePore™ filter has demonstrated high retention efficiency for structurally analogous coronaviruses, formal validation against aerosolized SARS-CoV-2 is not available. Users must perform their own method verification per CLSI MM18-A guidelines.
Can the filter be used for bacterial or fungal collection?
Yes—the ZePore™ membrane meets ASTM D6059-19 criteria for viable and non-viable particle capture; however, viability preservation is not guaranteed for all microorganisms.
What is the recommended maximum sampling duration at 10 L/min?
Based on pressure drop and RNA stability data, continuous operation up to 8 hours is supported under typical indoor RH (30–60%) and temperature (20–25 °C) conditions.
Does the system include flow calibration documentation?
No. Flow verification must be conducted pre- and post-sampling using an external primary standard calibrator traceable to NIST.
Are there regulatory restrictions on international shipment of unused VIRA-PORE cassettes?
Unused cassettes are classified as general laboratory consumables and are not subject to export controls under EAR or ITAR; however, end-user declarations may be required for customs clearance in certain jurisdictions.