Vaccines are suspensions of microorganisms administered with the goal of stimulating the body’s immune system against these same organisms, thereby preventing a clinical disease or reducing its severity. The microorganisms included in vaccines are inactivated or modified such that they are not able to cause clinical illness in the vaccinated animal

For more information on how vaccines work and proper storage and handling recommendations, read the BQA Antibiotics Stewardship for Beef Producers field guide and download SDSU Extension fact sheet on vaccine basics and tips to maintain vaccine viability.