Splenocytes derived from infected mice were collected 83 and 98 days after infection and were stimulated ex vivo using 4 pools of peptides: LACK murine (LACK–H2Db) and human (LACK–HLA-A*0201) haplotypes, and PEPCK murine (PEPCK–H2Db) and human (PEPCK–HLA-A*0201) haplotypes. This evidence concerns the gene PCK2 and infection.