Buy products from reputable sources. You need to be satisfied that the vaccines have been properly stored, are active, and are not damaged by being outdated or exposed to temperature extremes. Purchasing these products from a veterinarian or a reputable biological source will ensure that you are buying a safe, effective product and are also getting some low-cost, valuable advice. Always follow the label instructions. The label on the vaccine bottle is your best guide for proper storage.
Most vaccines are to be kept in the refrigerator.
Their activity may be destroyed by excessive hot or cold temperatures or ultraviolet light. In general, additives such as penicillin or selenium should not be added to vaccines unless recommended by the manufacturer. Use the vaccine's label as a guide regarding how and when to give that particular product. Vaccines should be given at strategic times of the year or season. These times vary depending on the vaccine and particularly on the disease which you are trying to control.