For each of 12 organs (bone marrow, thymus, spleen, liver, pre-scapular lymph node (LN), mesenteric LN, Peyer’s patch, duodenum, jejunum, ileum, colonic LN, and tonsils) we determined the following parameters: PLV proviral load (an indicator of residual PLV infection), FIV proviral load (an indicator of residual FIV infection), FIV mRNA load (an indicator of productive FIV infection), and mRNA expression of the cytokines IL-10, IL-12p40 and IFNγ. Here, IL10 is linked to infection.