<i>AppΔapxIΔapxIIC</i> cell culture supernatant <1 kDa fraction antiviral activity against PRRSV.

<p>Detection of the N viral protein in PRRSV infected SJPL cells by immunofluorescence. SJPL cells were infected with 0.5 MOI of PRRSV for 4 hours then incubated with DMEM culture medium alone (DMEM) (A) or either a DMEM culture medium fraction of <1 kDa (DMEM <1 kDa) (B) or a <i>AppΔapxIΔapxIIC</i> cell culture supernatant <1 kDa fraction (<i>App</i><1 kDa) (C) added to complete SJPL culture medium for 48 hours. White scale bar represents 200 µm. Pictures were taken at 100X magnification.