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Isolation and proliferation of the PPMV-1 GS02 virus. (A) Negative control of BHK-21 cells. (B) Syncytium formation (black solid arrowhead) in brain tissue homogenates infected with BHK-21 cells 48 hpi. (C) Transmission electron microscope images of allantoic fluids of GS02 (black solid arrows). (D) HA titers of GS02 proliferation in embryonated chicken eggs. GS02, Gansu/China/02/2020; HA, hemagglutination; hpi, hours postinfection; PPMV-1, pigeon paramyxovirus type 1.
