In the rZJ1-IL2-infected group, virus level in the blood peaked at day 4 post-infection (pi) (103.46 EID50 /0.1 ml) and drastically decreased at day 5 pi (100.9 EID50/0.1 ml), while in the rZJ1-GFP-infected group virus levels in the blood reached 105.35 EID50/0.1 ml at day 5. This evidence concerns the gene IL2 and infection.