G3BP1 and infection: To further investigate the formation of intracellular SGs during BPIV3 infection, MDBK cells were first infected (inoculated with) with BPIV3 (MOI = 2.0), treated with sodium arsenite (SA, 0.5 mM) as a positive control, and the aggregation of G3BP1 in the cells was examined using indirect immunofluorescence.