- Interferon-gamma and interleukin-4 mRNA expression by peripheral blood mononuclear cells from pregnant and non-pregnant cattle seropositive for bovine viral diarrhea virus. Waldvogel, A.S., Hediger-Weithaler, B.M., Eicher, R., Zakher, A., Zarlenga, D.S., Gasbarre, L.C., Heussler, V.T. Vet. Immunol. Immunopathol. (2000)