Concentration of PRRSv RNA in tissues and serum of PRRSv inoculated gilts and their fetuses (log₁₀ RNA copies/µL or mg).

RNA concentration is presented as mean log₁₀ copies/µL of serum or mg of tissue from qRT-PCR-positive samples.

SD = standard deviation (SD), LN = lymph node, % positive = percentage of samples tested positive within each category.

The thymus sample from one autolysed fetus and serum samples from two viable fetuses were missed during sample collection.

*Endometrium sample collected adjacent to the umbilical stump of each fetus.