FIG. 5.
Influence of hormone supplementation on C. suis S-45 infectivity in luminal epithelial cells isolated from swine genital tracts at different stages of the menstrual cycle. (A) Day 0, estrogen-dominant phase; (B) days 3 to 5, preprogesterone peak, intermediate phase; (C) days 16 to 21, postprogesterone peak, intermediate phase. Pr, progesterone; Estr, estrogen; ∗, significantly different (P ≤ 0.05) from the value for the control nontreated group; #, significantly different (P ≤ 0.05) from the value for epithelial cells treated with progesterone at a concentration of 10−6 g/liter. Calculations were by Student's t test.