Avian infectious bronchitis virus in Brazil: a highly complex virus meets a highly susceptible host population

infectious bronchitis (ib) is a highly aggressive disease for poultry in terms of symptoms and economic losses, and the control of this disease is difficult if flocks are not protected against type-specific challenges by the avian infectious bronchitis virus (ibv). this article summarizes data presented by the author at the workshop on infectious bronchitis 2009 on ib and ibv, including future developments on the field.