To understand if their establishment in the lungs upon influenza infection is dependent on type-1 TREG cells we make use of our previously setup transfer model whereby CD45.1 expressing CD8+ T cells (CD8CD45.1) are transferred into control Foxp3Wt mice or Foxp3ΔTbx21 mice that miss type-1 TREG14. Here, CD8A is linked to influenza.