Figure 4From: Maternal and fetal predictors of fetal viral load and death in third trimester, type 2 porcine reproductive and respiratory syndrome virus infected pregnant gilts Margin plots showing relative influence of significant factors on probability of fetal death. The probability of fetal death was calculated across a natural range of X-axis levels while the remaining factors were kept constant at their mean. The slopes of the lines demonstrate that high INFα levels contributed to fetal death (C), while elevated T helper cell numbers were protective (B). PRRSV RNA concentration measured at the maternal-fetal interface (A) had a quadratic relationship with fetal death probability. Additional adjacent PRRSV RNA positive and dead fetuses also contributed to probability of fetal death (D, E), as did the presence of PRRSV RNA in the fetus (F). Error bars represent 95% confidence intervals.Back to article page