Jin-Sheng Xu Feng, W. H., Tompkins, M. B., Xu, J. S., Zhang, H. X., & McCaw, M. B. (2003). Analysis of constitutive cytokine expression by pigs infected in-utero with porcine reproductive and respiratory syndrome virus. VETERINARY IMMUNOLOGY AND IMMUNOPATHOLOGY, 94(1-2), 35–45. https://doi.org/10.1016/S0165-2427(03)00059-X Feng, W. H., Tompkins, M. B., Xu, J. S., Brown, T. T., Laster, S. M., Zhang, H. X., & McCaw, M. B. (2002). Thymocyte and peripheral blood T lymphocyte subpopulation changes in piglets following in utero infection with porcine reproductive and respiratory syndrome virus. VIROLOGY, 302(2), 363–372. https://doi.org/10.1006/viro.2002.1650