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V. S. Hinshaw, V. F. Nettles, L. F. Schorr, J. M. Wood, R. G. Webster, Influenza Virus Surveillance in Waterfowl in Pennsylvania after the H5N2 Avian Outbreak, Avian Diseases, Vol. 30, No. 1 (Jan. - Mar., 1986), pp. 207-212
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Hinshaw et al. (1986) studied this question.
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