Health, Disease, and Biosecurity
What to know
This domain covers recognizing illness, preventing transmission, and responding to outbreaks. Know the chain of infection: agent, reservoir, route of exit, mode of transmission, route of entry, susceptible host. Interventions target any link - sanitation, PPE, isolation, vaccination, or vector control.
Understand the distinction between endemic (expected background) disease and an outbreak (excess cases above baseline). Sentinel animals and routine health monitoring are surveillance tools; they detect problems before they spread. Recognize common clinical signs - hunched posture, rough coat, ocular or nasal discharge, weight loss, diarrhea - and know that many are nonspecific, so diagnosis requires more than observation.
Traps
- Confusing disinfection (kills pathogens on surfaces) with sterilization (destroys all microbial life, including spores).
- Assuming PPE protects the animal only; it protects staff and prevents cross-contamination between rooms.
- Missing that traffic flow (clean to dirty) is a biosecurity control.
- Treating a single sick animal as automatically an outbreak.
Rule of thumb
Work clean to dirty, and when in doubt, isolate and report rather than move animals between rooms.
Worked example: Several animals in one rack develop diarrhea within a week. The correct first steps are to isolate affected animals, notify the veterinarian, and review shared equipment and traffic patterns - not to begin empiric treatment across the room.