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R. A. P. Crinion, M. S. Hofstad, Pathogenicity of Two Embryo-Passage Levels of Avian Infectious Bronchitis Virus for the Oviduct of Young Chickens of Various Ages, Avian Diseases, Vol. 16, No. 5 (Oct. - Dec., 1972), pp. 967-973
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Crinion et al. (1972) studied this question.
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