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.

(Immunologic) Memory

When an animal mounts an immune response against a foreign substance, some cells are created to 'remember' the antigens on that substance. If the animal is again exposed to the substance, these cells will help the body respond much faster and to a higher degree.

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