Vaccine failures in broiler chicken matrices immunized against avian encephalomyelitis.
Vaccine, serology, poultry farming, economic losses.
Avian encephalomyelitis is a disease that affects the central nervous system of birds and also causes a drop in egg production. Therefore, it is an important disease in industrial poultry. Thus, one of forms of prevention is the use of vaccines. The objective of this work is to identify possible factors that influence vaccine failures in chicken breeding farms. Will be used, serological monitoring data, coming from individual samples, from enzyme immunoassay tests (ELISA) the last 5 years. The information will be tabulated and submitted to statistical analysis, where information will be considered, such as, age of birds, region where the farm is located, S/P ratio and classification group in the ELISA test. After the evaluation, it is expected to identify the possible causes of birds classified in group zero in the ELISA test, besides establishing the prevalence of this occurence over the years and showing the economic losses generated, contributing to the establishment of preventive measures against vaccine failures.