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Identification of recombination RNA‐virus‐like particles. (A) PCR results for RNA virus like particles. (B) RT‐PCR results for RNA virus like particles. ①‐HA gene for all influenza A virus, ②‐H1N1subtype, ③‐H5N1 subtype, and ④‐H9N2 subtype. (C) The virus titer was validated by real‐time PCR with standard curve, and the virus titer were almost 107 copies per milliliter.
