Viral infection disproportionately reduces cytokine and hormone expression in the sera and lungs during pregnancy. Hormone expression in sera was quantified via ELISA in uninfected and infected non-pregnant mice for A. progesterone; C. prostaglandin F2α (PGF2α); and D. prostaglandin E2 (PGE2). Cytokine and chemokine expression in sera was quantified via Bio-Rad 23-plex assay in B. uninfected pregnant (E16) (N = 5) and non-pregnant mice (N = 5); E. uninfected and infected pregnant (E16; 4 d.p.i) (N = 5 per group); and F. infected (4 d.p.i) non-pregnant and pregnant (E16) mice (N = 5 per group). Student's t-test was performed between selected groups and significance noted above asterisk brackets. Inf.: infected; Uninf: uninfected; NP: non-pregnant; P: pregnant mice.