“…8 Normal pregnancy can be considered a Th2-dependent process. 9 Meanwhile, progesterone has been shown to significantly inhibit the expression of IFN-␥ in PBMCs in pregnant cows. 15 In pregnant animals, infection with influenza H1N1 induced further Th2 deviation due to a further significant increase in the levels of IL-4 than IFN-␥ on the basis of the already skewed Th2 immunity.…”