Which of the following best describes the detection of adventitious bacteria, viruses, or parasites at an early stage of infection in an animal facility?

• A. Health surveillance
• B. Quality assurance
• C. Animal observation
• D. Environmental monitoring

Answer: (A)

Detecting adventitious pathogens early relies on actively monitoring the health status of the animal population through a formal program. Health surveillance combines routine health checks with diagnostic testing, such as serology or PCR, and often uses sentinel animals to catch infections before they cause clinical signs or spread. This proactive approach protects colony health, preserves experimental integrity, and helps meet regulatory expectations.

Quality assurance is about ensuring processes, facilities, and procedures meet standards, not specifically about identifying infections in animals. Animal observation is valuable for noticing outward signs of illness, but many infections are subclinical early on and can be missed without a structured program. Environmental monitoring looks at the facility environment for contaminants, which is important but does not directly detect infections within animals at an early stage. Hence, health surveillance is the best description of early detection in this context.