Handbook entirely dedicated to avian infectious laryngotracheitis (ILT), based on a handy and visual approach of the topic. This handbook has been developed by prestigious, highly experienced and renowned authors, being experts in the area of avian diseases. An up-to-date and complete review has been carried out including the most significant contents, such as aetiology, epidemiology, pathogenesis, clinical manifestations, etc. A chapter about vaccination has been properly developed in order to provide the main guidelines to avoid vaccination failures and control its prevalence and incidence.