What is the most appropriate sequence for inspecting animals on a suspect FMD farm?

• A. Healthy animals with no sick animal contact, healthy animals with contact, hospital facility
• B. Hospital facility, healthy animals with no sick animal contact, healthy animals with contact
• C. Healthy animals with sick animal contact, healthy animals with no contact, hospital facility
• D. Healthy animals with no sick animal contact, hospital facility, healthy animals with contact

Answer: (A)

The main idea being tested is minimizing the risk of spreading the disease by inspecting areas in order from lowest to highest exposure risk. Starting with healthy animals with no sick animal contact keeps you in the cleanest zone first, reducing the chance that you carry any contamination into areas that are more exposed. Next, you move to healthy animals that have had contact with sick animals; this area has a higher risk, so inspecting it after the clean group helps catch issues while still containing potential exposure. Finally, the hospital facility is visited last because it houses sick or suspect animals and represents the highest contamination risk. By handling the least-risk area first and reserving the most-contaminated zone for last, you can more effectively implement PPE changes and decontamination steps between zones and reduce cross-contamination.

Other sequences would expose clean groups to higher-risk areas earlier or move between high- and low-risk areas in a way that increases the chance of spreading virus between groups.