The levels of the Tpsg1 (tryptase gamma 1) transcript before infection and at day 3 p.i. were not significantly higher in C57Bl/6J (1.6 and 2.8 fold respectively) compared to DBA/2J mice, whereas at day 6 p.i., the levels were significantly higher in C57Bl/6J compared to DBA/2J mice. Here, TPSG1 is linked to infection.