Fig. 2
From: Current and prospective control strategies of influenza A virus in swine
Schematic diagrams of influenza A virus and its evolution. a) The influenza A virion is an enveloped virus containing 8 negative sense singlestranded RNA segments. b) Genetic variation accumulates in the IAV genome during RNA replication. c) Novel IAVs can arise through reassortment of the 8 genomic segments during co-infection of a single host