Veterinary Drug Handbook (VDH) is the reference veterinarians turn to when they want an independent source of information on the drugs that are used in veterinary medicine today.

Acquired immunity

Refers to the immunity that can be built up to a disease or illness that an animal would normally fall victim to. There are several reasons why this is, .and it may be an active immunity (antibodies build up through having the disease) or passive immunity (e.g., .immunity passed on through mother's milk or an animal's serum).