IL9 overexpression also induced a nearly threefold reduction in CD3+ T lymphocytes at 14 days after CVB3 infection compared to controls (AAV9-Control: 1.2% CD3-stained cardiac area ± 0.2 vs. AAV9-IL9: 0.4% CD3-stained cardiac area ± 0.1, p < 0.001; Fig. 6E,F). This evidence concerns the gene IL9 and infection.