Figure 4

Relationship between ratio of \({\mathbf{CD163}}_{{{\mathbf{endo}}}}^{{\mathbf{ + }}}\) : \({\mathbf{CD163}}_{{{\mathbf{plc}}}}^{{\mathbf{ + }}}\) and PRRSV RNA concentration in fetal thymus. Scatter plot of ratio of numbers of CD163⁺ cells in the endometrium and CD163⁺cells in fetal placenta (Y axis)_, and PRRSV RNA concentration (log₁₀ copies/mg) in fetal thymus (X-axis). Each dot represents one fetus. Results indicate that PRRSV RNA concentration in fetal thymus is positively associated with ratio of \({\text{CD163}}_{{{\text{endo}}}}^{{{ + }}}\):\({\text{CD163}}_{{{\text{plc}}}}^{{{ + }}}\) (all fetuses with viral load less than 6 log₁₀ per mg had endo:plc ratios less than 0.4).