Kazuhiro Yagyu, Shuichi Ohta, Detection of Infectious Bronchitis Virus Antigen from Experimentally Infected Chickens by Indirect Immunofluorescent Assay with Monoclonal Antibody, Avian Diseases, Vol. 34, No. 2 (Apr. - Jun., 1990), pp. 246-252
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Yagyu et al. (1990) studied this question.