PVM-infected mice showed increased relative levels of TL1A and IL-18 during acute thymus atrophy at Days 10 and 14 (Fig. 7I–J), while MCVM-infected mice displayed increased TL1A and IL-18 only during acute thymus atrophy on Day 5, but not during the early infection stage (Day 2), or in the recovery phase (Day 8) (Fig. 7K–L). This evidence concerns the gene TNFSF15 and infection.