RBFOX3 and infection: While adult and aged animals showed no difference in the proportion of NeuN+ cells within the hippocampal CA3 region following MHV‐JHM rechallenge compared to primary MHV‐A59 infection, we observed an increase in the proportion of TUNEL+ cells within the hippocampal CA3 of adult rechallenged mice compared to primary infected adult animals (Figure 5d,e).