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PCV1 quantification results after the infectivity assay on BK cells. The PCV1-prototype group (a and b) and the PCV1-GSK group (c and d) were pretreatedwith d-glucosamine (a and c) or not (b and d) before inoculation. m.o.i. ranges from 10 to 0.01 with a mock-infection group which remained negative throughout.
