Infectious bronchitis （IB） is one of the most important viral diseases of poultry; it causes major e- conomic losses to the poultry industry. Variation of IBV may be caused by not only gene mutation and recombination, but also the pressure of immunization. The worldwide scholars have been deeply studying IBV and make important progresses on molecular biology and structure proteins. This article summarized the progress on the structure and biological function of structure proteins. These studies offer a scientific basis for the path...
