What is the reason that the congenital PRRSV infection is basically restricted to the end of the gestation?
The correct answer is that the susceptible cells are not found in the placenta before. In line with this, there are more CD163+ and Sn+ cells (the target cells for the PRRSV infection) in the endometrium and placenta collected at 90-110 days of gestation than at an earlier stage.
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