(a) Veterinary diagnostics. APHIS will not charge user fees for veterinary diagnostic services under the following conditions:

1. (1) When veterinary diagnostic services are provided in connection with Federal programs to control or eradicate diseases or pests of livestock or poultry in the United States (program diseases);
2. (2) When veterinary diagnostic services are provided in support of zoonotic disease surveillance when the Administrator has determined that there is a significant threat to human health; and
3. (3) When veterinary diagnostic reagents are distributed within the United States for testing for foreign animal diseases.