Abstract
The Bovine Respiratory Disease Complex (BRD) is characterized by the animals' respiratory tract infection, which can be viral, bacterial origin or through the association of both. BRD has been identified as one of the most important causes of morbidity and mortality in intensive livestock, especially in young animals, causing serious economic losses with the use of medicines to treat animals and significant weight losses, directly affecting the bovine meat production chain. One of the main preventive measures carried out by the BRD is the application of vaccines to animals on arrival at the termination sites, without knowing whether the animal has already been infected by any of the agents