1. Acres, S.D., Isaacson, R.E., Babiuk, L.A. & Kapitany, R.A. (1979). Immunization of calves against enterotoxigenic colibacillosis by vaccinating dams with purified K99 antigen and whole cell bacterins. Infection and Immunity, 25(1), 121-126.
2. Al-Alo KZK., Nikbakht Brujeni, G., Lotfollahzadeh, S., Moosakhani, F. & Gharabaghi, A. (2018). Correlation between neonatal calf diarrhea and the level of maternally derived antibodies. Iranian Journal of Veterinary Research, 19(1), 3-8.
3. Avila, F.A., Paulillo, A.C., Schocken-Iturrino, R.P., Lucas, F.A., Orgaz, A. & Quintana, J.L. (1995). A comparative study of the efficiency of a pro-biotic and the anti-K99 and anti-A14 vaccines in the control of diarrhea in calves in Brazil. Revue d'élevage et de médecine vétérinaire des pays tropicaux. 48(3), 239-243.
4. Collins, N.F., Halbur, T., Schwenck, W.H., Hoogeveen, P., Pierce, R.L., Behan, R.W. & Pankratz, D. (1988). Duration of immunity and efficacy of an oil emulsion Escherichia coli bacterin in cattle. American Journal of Veterinary Research, 49(5), 674-677.
5. Contrepois, M., Girardeau, J.P., Dubourguier, H.C., Gouet, P. & Levieux, D. (1978). Specific protection by colostrum from cows vaccinated with the K99 antigen in newborn calves experimentally infected with E. coli Ent+ K99+. Annals of Veterinary Research, 9(2), 385-388.