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00925njm 22002777a 4500 dc Costa, Taiana author Chaves, Aida J author Valle, Rosa author Darji, Ayub author van Riel, Debby author Kuiken, Thijs author Majó, Natàlia author Ramis, Antonio author 2012-04-10 This study assessed the presence of sialic acid α-2,3 and α-2,6 linked glycan receptors in seven avian species. The respiratory and intestinal tracts of the chicken, common quail, red-legged partridge, turkey, golden pheasant, ostrich, and mallard were tested by means of lectin histochemistry, using the lectins Maackia amurensis agglutinin II and Sambucus nigra agglutinin, which show affinity for α-2,3 and α-2,6 receptors, respectively. Additionally, the pattern of virus attachment (PVA) was evaluated with virus histochemistry, using an avian-origin H4N5 virus and a human-origin seasonal H1N1 virus. There was a great variation of receptor distribution among the tissues and avian species studied. Both α-2,3 and α-2,6 receptors were present in the respiratory and intestinal tracts of the chicken, common quail, red-legged partridge, turkey, and golden pheasant. In ostriches, the expression of the receptor was basically restricted to α-2,3 in both the respiratory and intestinal tracts and in mallards the α-2,6 receptors were absent from the intestinal tract. The results obtained with the lectin histochemistry were, in general, in agreement with the PVA. The differential expression and distribution of α-2,3 and α-2,6 receptors among various avian species might reflect a potentially decisive factor in the emergence of new viral strains. Costa, Teresa, Andrea Chaves, Rosa Valle, Ayub Darji, Debby Van Riel, Thijs Kuiken, Natàlia Majó, and Antonio Ramis. 2012. “Distribution Patterns of Influenza Virus Receptors and Viral Attachment Patterns in the Respiratory and Intestinal Tracts of Seven Avian Species.” Veterinary Research 43 (1): 28. doi:10.1186/1297-9716-43-28. 0928-4249 http://hdl.handle.net/20.500.12327/2900 https://doi.org/10.1186/1297-9716-43-28 Distribution patterns of influenza virus receptors and viral attachment patterns in the respiratory and intestinal tracts of seven avian species