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Plasma corticosterone levels. Each point represents an individual untreated control (CTL) mouse (at 22 °C) or mice in the immunization protocol maintained at the indicated temperature for 9 wk. Inoculated mice at 28 °C had higher corticosterone levels than inoculated mice at 22 °C (P < 0.04) and the CTL mice (P < 0.004). Lines indicate the mean plasma corticosterone concentration in each group.
