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PathogenBinder®: The Gold Standard of Sentinel-free Soiled Bedding Sampling
The Case for Better Rodent Health Monitoring
For decades, soiled-bedding sentinel testing has served as the standard method for infectious agent screening in research rodent colonies. This approach was practical and effective in the era of open-top cages and minimal biosecurity protocols. However, with the widespread adoption of microisolator and individually ventilated cage (IVC) systems, the limitations of traditional sentinel methods have become apparent.
Five challenges undermine the reliability and consistency of soiled-bedding sentinel testing in today’s vivarium environments:
| 1. | Reduced Pathogen Transfer Efficiency | Modern cage design limits the spread of infectious agents, leading to lower prevalence and missed detections. |
| 2. | Lack of Standardization | Differences in bedding transfer methods contribute to inconsistent infectious agent detection. |
| 3. | Poor Environmental Survival of Agents | Many infectious agents do not survive well in the environment, preventing transmission to sentinel animals. |
| 4. | Insufficient Infectious Dose | Infectious material in bedding may not reach a high enough level to transmit to sentinel animals. |
| 5. | Ethical Limitations | Reliance on sentinel animals conflicts with evolving expectations around animal welfare and research ethics. |
These limitations aren't just technical—they directly impact the reproducibility of research, the health of animals and staff, and the integrity of vivarium operations. Health monitoring has become increasingly critical to research compliance and animal care, so the need for more sensitive, standardized, and noninvasive approaches is evident.
A Newer, Sustainable Approach to Animal Health Diagnostics
Sentinel-free soiled bedding (SFSB) sampling has transformed rodent health monitoring by eliminating sentinel animals and enhancing pathogen detection. SFSB sampling relies on exposing contact media to soiled bedding from colony cages to capture pathogens, which are then detected through PCR testing.
What Makes PathogenBinder SFSB Methodology Unique?
The PathogenBinder sampling method uses data-validated contact media agitated within a dedicated collection box to maximize exposure to environmental dust particles. The choice of contact media significantly impacts pathogen detection efficacy. More than 25 contact media types were tested to determine the optimal combination of media and agitation to detect pathogen performance with regular sampling timelines. Both contact media type and treatment protocol play a role in providing the optimal process for this method.
WHITE PAPER
PathogenBinder: A Refined and Standardized Soiled-Bedding Sampling Method
This paper describes the investigations to compare sampling treatment schedules and to select contact media to create the PathogenBinder PCR sample collection process.
A Science-backed and Lab-tested Standardized Method for All Cage Types
Our extensive research led to a refined, standardized method incorporating the highest-performing contact media and validated sampling techniques. It is compatible with all cage types, including static microisolator caging, individually ventilated cages, and open-top caging used in research vivaria.
Using a dedicated collection box eliminates the challenge of agitating bedding within individual cages, an inefficient approach that may also allow dust to escape. Research can continue in those cages without further disruption.
Get started with your complimentary PathogenBinder collection kit now.