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Twenty and ten activities of intercontinental gene flow were identified for H13 and for H16 viruses, respectively. At least two antigenic alternatives of H13 and at ltercontinental gene circulation, while the antigenic variation among H13 and H16 LPAIVs. The circulation regarding the subtypes H13 and H16 appears to be maintained by a narrower number range, in particular gulls, compared to the majority of LPAIV subtypes that can there