Figure 4From: Comparative pathogenesis of type 1 (European genotype) and type 2 (North American genotype) porcine reproductive and respiratory syndrome virus in infected boarImmunohistochemistry of semen smear from boars experimentally infected with type 2 porcine reproductive and respiratory syndrome virus (PRRSV) at 14Â days post-inoculation. PRRSV antigen is detected in the non-sperm cells (arrow) and spermatocyte (arrowhead).Back to article page