4Jone R C.Infectious bronchitis the latest situation . International Hatchery Practice,1996;10(3) : 3-7.
5Cheng beon song,Jae Hong Kim,Yong Jeony Lee. Detection and claisitlcation of infectious bronchitis virus isolated in kcrea by dct immunobiotting assay using monocional antibodies.Avian Diseases,1998;42(1 ) : 92-100.