Key points in fine tuning the use of a specific vaccine against very infectious bursal disease

摘要

A specific IBD vaccine can effectively control very virulent infectious bursal disease but there are plenty of pitfalls that can lead to failures. The author emphasises the vital importance of identifying the causative virus strain and getting the timing of vaccination right. Specific vaccines against infectious bursal disease (IBD) offer satisfactory solutions to most problems in which the very virulent IBD virus (vvIBD) is implicated. They provide a next step after the mild and intermediate vaccines in the control of IBD and have proved to be effective in reducing mortality caused by the disease, However, poultry veterinarians and producers are sometimes hesitant to administer this kind of product because of past experience when the application of too 'hot' vaccines irreversibly damaged the bird's immune system.