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Virus replication kinetics of avian viruses in ex vivo trachea and lung. (A–H) Viral replication in ex vivo biopsies infected with 106TCID50/ml of influenza viruses as indicated by TCID50 assay. Each chart shows the virus titer from three independent experiments. (I–L) Immunohistochemistry for influenza nucleoprotein in the bronchioles of A/Duck/Bavaria/1/1977 9 (I), A/Quail/HK/G1/97 (J), A/Chicken/HK/Y280/97 (K) and A/Northpintail/HK/MP5883/04 (L).
