On days 16–18 post infection via IN route, M2MR.HY, M2stop.HY and Y120F.HY had similar frequencies of YFP+ B cells (doublet-discriminated/CD3−CD4−CD8−/B220+), whereas Y129F.HY infected mice had a lower frequency of infected B cells (Figure 5A). Here, PTPRC is linked to infection.