Which organization houses the laboratories that perform bacteriology, virology, pathology, and serology?

• A. CVB
• B. APHIS VS
• C. USDA
• D. NVSL

Answer: (D)

The key idea is recognizing where the national animal-disease diagnostic work is centered. The laboratories that perform bacteriology, virology, pathology, and serology are housed within the National Veterinary Services Laboratories. NVSL serves as the United States’ main reference lab network for animal health diagnostics under the USDA’s APHIS Veterinary Services. While APHIS Veterinary Services provides oversight and direction, and USDA is the department, the actual facilities where these tests are conducted are NVSL. The other options either refer to regulatory or overarching entities (like CVB or the department) that don’t host the broad diagnostic laboratories.